It had been a challenging few weeks - the seasonal sickness that descends on all those condemned to office life had struck and left us tired and exasperated. To cap this, of all the body parts which could choose to exact sympathetic rebellion, my right foot was painful. I'd spent the last week of spasmodic coughing and sneezing poring over maps of Essex and I just couldn't find an easy way of advancing along the A13 - the walk was either too short to be interesting, or far too long for my current condition. Meanwhile, the day crept up on me strangely quickly. Rather unexpectedly though, a reserve plan sprang into being. I'm not sure how, or why I found myself idly looking over the OS Map of the Lee Valley - but it struck me it was time to return to the river I'd spent so much time mythologising over the last few years. I planned hastily: I'd walk into London rather than out, taking advantage of the parallel railways which flank the Lea Valley to make my escape if my range was limited by fatigue or foot-rot, and I'd start outside the M25. It made for a good long walk which symbolically cut another axis into that great circuit. The day dawned surprisingly fortuitously for a walk. The weather was perfect for walking, with blue skies flecked with cloud and a cool breeze. My foot too, appeared to have relented and healed somewhat. I tested my boots and found that they were far more comfortable than regular footwear had been. The journey to London was a relaxing, quiet pause - the first in a few busy weeks and I stalked off for the tube at Paddington in good spirits. A quick spin around the Circle to Liverpool Street, and then armed with coffee, onto a suburban service out into Hertfordshire. Rebranded as TfL Rail, the Overground Orange motif spattered across the decor, with a freight of spaced out kids nodding and sputtering home from a Friday night in the clubs. Over the rooftops of Bethnal Green and Hackney, then into the strange suburban hinterland which breaks like a spent wave on the western side of the Lea Valley. The Turkey Brook, passing under the line deep below signalled that it was almost time to alight, and to begin walking.

I was briefly disoriented on exiting the station - blinking at my map in the sunshine, I soon spied Trinity Lane heading off between ranks of suburban houses. The lure of possible supplies on the High Street was strong, but I had the urge to start walking. The surprisingly warm morning was wearing on, and I was still a little concerned about my walking speed and endurance despite having a pretty solid escape plan. In truth I didn't want to have to abandon a walk - it just wouldn't feel right. Immediately on entering the lane I realised I was walking a watercourse already. Sandwiched between the houses on my right and the road was a deep ditch, bridged by driveways into the pleasant looking suburban dwellings. Theobald's Brook, having emerged from under the road junction at the station, was leading me to the river. Being hazy on an exact route, I decided to follow Trinity Lane into the Lee Valley Country Park with the brook as my guide. Eventually the road dwindled to a lane leading to a level crossing over the railway from Cheshunt, and after a careful crossing I found myself in the park at last. The brook swerved away to join the Small River Lea, while the path opened into a vast greensward dwarfed by pylons. I recalled being taught as a small boy that electricity and water don't mix well - but here in the Lea Valley they are constant companions. Pressing on into the park I crossed the Lee Navigation near the Lee Valley White Water Centre, complete with its plaques bearing witness to Olympic renewal. The path rose here, with a good view along the quiet, emerald waters of the Navigation. There was a distant hum of traffic and a buzzing of insects. I was back in the valley, and glad to be here.

For a brief spell, I was walking beside the Old River Lee - the slow, stymied and meandering sibling of the Navigation which winds along the western edge of the valley. Shaded by trees, the emerald surface of the water rippled lazily as I approached the road near Waltham Town Lock. I had a choice as I surfaced - to continue on the banks of the river, or take the path beside the Navigation. I chose the western path - essentially because it appeared to involve less diversions around incomplete pathways, less complication - and perhaps less chance of temptation to deviate from my goal. Also, if I made it all the way, I'd be leaving the path at the same point where I parted from the valley over three years ago. It was a symbolic relinking, if nothing else. Immediately on crossing the A121 and descending to the bank, the character of the water changes. Hemmed in by a vacant industrial wharf in the midst of a dusty clearance process, the water is slick and dark. Stretching south, butting against the straight line of the Navigation are a range of warehouses with 'excellent motorway links' and claiming journey times of an hour to Heathrow. For the first time today I feel almost uncomfortably hemmed in by water - I sense the Small Lea lurking to the west, and only a narrow spit divides the Lea and the navigable channel here. Trees hang listlessly between them, and the surface shimmers with chemical rainbows and a faint heat haze. I'm suddenly reminded of The Waste Land:

The river sweats oil and tar

But the walk is pleasant. I'm not really hitting my usual pace - I'm just enjoying the cool of the river breeze and the sun on my face. It feels like a long time since I walked in sunshine. The rivers stay close here, as the shudder of motorway traffic begins to make itself heard. There is no great ceremony here, no arcing bridge. Instead a low, concrete bridge spans the collected rivers, the traffic just feet from my face as it shrills by. The road is flowing faster than the water, a lane of large lorries obscuring the sun before I reach the bridge. It's cool in the shade, and the slope under the pillars opens into a muddy lake of litter. A recently dumped, not yet torched Peugeot 206 awaits its fate beside a pile of clothes and soft-furnishings. It is surprisingly intact, and appears to have been driven here. The thought of off-roading across the marshes is absurd. Beyond the plain of waste, I spot a gateway leading up a rise and away from the river. I'm reluctant to leave the path - but I'm drawn to the light after being under the bridge. It's a slick, grassy scramble up the muddy slope on the edge of Rammey Marsh with just occasional tufts of coarse grass to aim a boot at - but I'm rewarded with a chance to be at close quarters with the M25 in a way I'd never quite expected. A huge Variable Message Sign curves over the carriageway nearby, and a bold blue board marks the border in capital fashion: HERTFORDSHIRE. As traffic shudders by, little more than pale streaks of colour and rushes of air, the infrastructure broods silently. The scale of the bridge, the towering pylons forming a lattice of wires across the road, the massive hulk of the signs - it is strangely awe-inspiring up close, out of the mediated frame of a windscreen. I paused here for quite a while, just watching the road while contrails crossed the sky. Here - for perhaps the only time on my walk - water wasn't the dominant force.

Scrambling back down the bank was more complicated and less dignified than the ascent, but I was soon back on the path and heading south. The river runs in three channels here - the Navigation and Diversion parting to envelop Enfield Island Village, with the Cattlegate Flood Relief Channel skirting the eastern fringes of the valley. I confess to being lost in the terminology here - ill-prepared for the complexities of the waterways I'm trying my best just to stay on course. But the lure of refreshment is too strong, and I climb the steps onto the bridge which leads into the former Royal Small Arms Factory. Inside the water-bounded compound it's a mix of old and new - long, low brick buildings which date from the island's former occupation rub gables with new housing stock, built in similar but slightly off-key styles. The overall affect is jarring and oddly creepy. There are few people around until I get to the tiny and ill-organised Tesco Express store - the only amenity here which is in business. I head back to the river with my purchases in hand. It's dusty and dry here, work still going on to build more housing on the southern edge of the site. I recall the tales of toxic dust when the main area was upturned and built on, and I try not to breathe until I'm safely in the shade of Swan and Pike Pool. I rest beside the water while across the cluttered, dirty pond someone does yoga silently. It feels calm and restful enough here - but that seems such an unlikely pursuit so close to the heavily polluted motorway air.

The valley changes character as I set off again. Turning south where the huge Enfield Energy plant dominates the view, the Navigation is a broad, straight canal. Right away we're joined from the west by a confluence of the Small Lea and the Turkey Brook, running in at a reedy, inauspicious junction. The Navigation's other sister streams have parted from us, running along the eastern edge of the valley and now separated by the vast hourglass-shaped expanse of the Chingford Reservoirs. The most northerly is the King George's Reservoir, with steeply raked grass banks separating countless millions of gallons of water from the rivers. This was, until 1951 an aerodrome. This flat, empty situation on the valley floor proved perfect for these experiments in watering a vast urban metropolis. A similar undertaking would almost never succeed now, risking strangulation by the twin hands of planning regulation and protest movement. The challenge of holding back such vast volumes without slippage and disaster resulted in a long-standing British dominance of the soil dynamics field. The towpath continues, skirting the minor kinks in the southerly course of the Navigation. An overflow channel leaves the canal, a concrete culvert full of mud and silt, hugging the perimeter of the artificial lake as a causeway carrying the A110 separates it from the William Girling Reservoir. The causeway is a passage from pub to pub - from Nags Head Road to Kings Head Hill, taverns celebrated along a route marking one of the few horizontal crossings of the odd, somewhat beleaguered valley. This lake - named for the chairman of the Metropolitan Water Board at the time of inauguration - is more elegantly tapered than its northern counterpart, the southern reaches pinched by the rising flanks of land which support Chingford and Tottenham. Looking west, a rank of four tower blocks at Ponders End dominate the horizon, rudely emphasised by the empty industrial lots between the river and the housing estates of Brimsdown and Edmonton. South of here, the western bank is dominated by the Lee Valley Athletics Centre - a pale shadow of what was meant to be the pre-Olympic dream: a revitalisation of the valley through sport has always been the officially preferred mechanism. At Pickett's Lock a crumbling boathouse is sheltering three preening swans, the plans for the 2005 World Athletic Championships long forgotten and eclipsed by the great events of 2012. The embarrassment of earmarking a site which was too difficult to reach and too expensive to develop is almost erased by later profligacy, by a project just too big to fail. There is a golf course now, man-made lakes, a sports centre to replace the original Pickett's Lock centre. But thankfully the river still runs undisturbed. The sun is riding high now and my forehead is starting to sting where I'm sweating. I fear I may be turning pink. I see virtually no-one on the path now except for the river-dwellers working on their boats and the occasional jogger. Most sane Englishmen are safely indoors, even though the April sun lacks the power of summer. I walk on.

Almost hypnotised by the long, yellow stone path stretching ahead, I'm surprised to hear the sound of traffic returning. The path opens into a vast stone chamber under the junction where the North Circular meets the Ravenside Retail Park. The complex web of slip-roads spans the entire valley, with a roundabout dominating the dormant space between the Lea and its navigable stream. As I pass under I instinctively turn to photograph daylight above me, penned in between the carriageways. I press the shutter as two huge birds spread their wings and head for the sky between the slip roads. Meanwhile a rowing boat filled with laughing Sea Cadets lurches and splashes under the A406. I'm inside the City's inner road necklace now - and any sense of rurality disappears. The walkway is narrow, a metal crash-barrier separating it from the dusty, unadopted mess of Towpath Road - existing only to serve a complicated jumble of businesses and the Arriva Edmonton Bus Depot, forced into the dwindling neck of land between the rivers. Dust rises from the passing buses, obscuring what appears to be an illicit trade in waste white goods. I'm pressed against the barrier for fear of cyclists who don't ring bells here. Thankfully, the River Lea soon rejoins and I'm on a thin spit of land between two wide, slow streams of water. The rank of pylons which have shadowed my route here from Waltham Cross have split, flanking the channel on both sides, placing me in an eerie procession. A genuinely electric avenue. A glance at the map shows an explosion of water here - the bulging circle of Banbury Reservoir is the last of the Chingford Chain, with the Walthamstow waters taking over the valley. I'll see less of these - they favour the eastern side of the Lea Valley, with only the Lockwood Reservoir sidling up against the River before I leave the valley.

This last stretch is hard going. It's been a hotter, slower walk than I'd expected and despite being mesmerised by the strange vistas of the valley, I'm tiring. A curving footbridge gives access to Tottenham Marshes and a series of well-used green links along the edge of Pymmes Brook. The afternoon is cooling a little, but the sun remains high - and couples push strollers and wander the path. The eastern bank is quieter until Stonebridge Lock where the only option is to cross the gates and join civilisation. The former café and toilet block is a focus for walkers - a place to reevaluate their limited post-prandial stamina and turn back before it's too late. Before they are walking the valley like me. I spot an entire family on a bench near the lock gates, the elder gazing down at the end of his walking stick. When I resurface from using the facilities they have crossed the lock and assumed an identical position on the western bank. My ceremonial guides as I embark on the last leg of my walk for today. The Navigation is busy between here and Tottenham Lock - the waterway filled with boats in various states of repair, from semi-sunken to beautifully decorated, and the footpath busy with walkers and cyclists. An alarmingly drunk man mis-steps toward the water, a passing family oscillating between concern and distaste. When I pass him he's facing inland and fumbling with his flies, smiling blissfully to himself. Saved again by instincts which defy his inebriation.

Despite knowing how close I was to my goal, Tottenham Lock came upon me unexpectedly. The gentle curve of Ferry Lane bridge and the strange oblique sculpture which sits beside it appeared in negative due to the glare of the sun - which now also bounced back at me from a range of tall apartments built since my visit in 2012. Pymmes Brook was now alongside me too - a stinking ditch in a divided concrete chasm, chasing its final few metres before being subsumed into the broader waters of the Lea. At Ferry Lane I resurfaced and crossed the road to survey the spot I'd left the river three summers ago. Aside from the near-completion of the vast development behind me, little enough had changed. But for me - everything had. I'd always anticipated picking up this walk in a northerly direction, heading away from the City and the repellent enforced buoyancy of the Olympic summer. Life took a different turn, and it seemed fitting to be coming back to civilisation, part of something bigger and more human from an entirely different angle. The last few steps to the platform at Tottenham Hale were as painful and frustrating as last time. There is no access to the station from the east, no one walking in from the lakes. It felt strange to be coasting across the wide expanse of green marshland near Clapton, after spending a day surrounded almost entirely by the waters of the Lea Valley and I realised I was catching probably my first glimpse of the familiar city skyline today as I headed back towards Liverpool Street. The wide swathe of water continues, paralleling the railway line - and I know that I'll need to return to walk the eastern reaches if I'm to fully understand this remarkable and confusing place.

You can find a gallery of images from the walk here.

As the end of the year approaches, I find myself seeking some sort of summary. It has been a testing year - full of anxiety and uncertainty - and these walks have been beacons of a sort. Marking time against interminable bureaucracies, counting backwards away from grief and disappointment. Things are changing - there are, it's fair to say, many things which are cautiously approaching resolution. But I find these walks take me out of the churn of more pressing things, into a parallel channel which flows at a different pace. Sometimes challengingly faster, sometimes surprisingly ponderous - but always a change. Today wasn't promising in many respects - it started between storms at a windy railway platform, and by the time my train crept into Paddington a little behind schedule a grey drizzle had settled in for the day. This was punctuated by sudden squalls of rain, whirling and eddying whenever I strayed into an even moderately open area. It wasn't great walking weather - but I was determined to walk. Grim determination or foolhardy stubbornness? Hard to say at this early stage. It was though, pleasant not to have to rely on onward transport to get me to the beginning of the trek. As I was setting out from Paddington on foot, I tarried long enough to get coffee before leaving the station and doubling back along London Street. Beside the hulk of the trainshed I encountered a curious item of street furniture: a three-troughed, circular urinal which rose from the ground - presumably for those weekend evenings when inconvenienced men are more than willing to decorate any vertical surface without much concern about bystanders. I didn't tarry here - though I wondered whether its use in the busy daytime would catch on? I think we'd need to become far more shruggingly European for this to become a fixture. Instead I pressed on, skirting the edge of St. Mary's Hospital and diverting around workmen who appeared not to have decided if they were dismantling or erecting a building beside the station. Via an unexpected zig-zag I crossed Paddington Basin - my first sight of water - and used the backstreets to regain the canal near the complex mess of junctions on Harrow Road. As I plunged beneath the flyover, I delighted in the sudden muting of the traffic. The scour of tyre on wet tar was turned into a dull rumble. If nothing else, today promised to be a peaceful excursion.

Shortly after joining the canal I found myself at Brownings' Pool - or Little Venice as it's quaintly known. The canal broadened into a trapezoid pool with a small islet anchored midstream. Around the towpath, expensively decorated narrowboats were moored, presumably laid up for the winter now. Here I had a final choice - head west along the Grand Union to Birmingham and beyond, or to maintain my planned course east for the Thames. I resolved to stick to my plan and turned east, soon realising that the towpath on the eastern bank gave no access to the Regents Canal. The tidy but windswept Rembrandt Gardens fronted against the street here, and I slalomed their gates to gain Warwick Avenue and cross the bridge. Looking north I spied the sleek, modern tower of St. Saviour among the plaster-fronted villas of the western suburbs. It was time to take to the water. I'd walked the bulk of the Regents Canal before - years ago, I'd tackled the stretch around Regents Park to Camden, and in the dizzy Olympic summer of 2012 I'd walked from the eastern portal of Islington Tunnel to the canal's conclusion at Limehouse over the course of a couple of walks. But it had been a long time, and there were loose ends to join here in the west. It felt right to be tackling an uncomplicated circuit today - the familiar seen from a different angle is always comfortingly unnerving. This early part of the walk was though, especially disconcerting. After just a few steps on the canal I was driven onto the footpath of Blomfield Road, a sedate avenue of heavily pollarded trees which runs east along a private section of the canal which is designated as a permanent mooring. In the chilly grey morning, the little puffs of steam from the boats was strangely inviting - and someone, somewhere was cooking breakfast. Up ahead the canal disappeared under a glass-fronted restaurant and into Maida Vale tunnel. Excluded from the water again, I headed over the broad but oddly quiet Edgware Road and plunged back into the suburbs. The houses hereabouts were large and impressive, but as I pushed on into the hinterlands there was a sudden change, and I found myself walking beside a pleasant but obviously down-at-heel municipal development, with the canal in a deep chasm beside me. Looking down I could see curious concrete bunkers embedded into the steep wall of the opposite bank. The canal must be a strange neighbour in some respects.

Another towpath diversion sent me overland again, emerging on the southern bank and walking along a raised walkway beside another housing estate. Hemmed in by railways, this area has been turned over to the National Grid, with the vast Lisson Grove complex of transformers and pylons filling a huge triangle of land. The wires hissed and shivered in the drizzle, a metallic tang in the air. You could smell electricity here - the slightly fried, plastic smell coming back to me from days in the Air Cadet hut deliberately overloading capacitors until they exploded. Passing under the Metropolitan and Chiltern Lines, and again crossing the canal, the area became much more sedate. A wooded channel taking a broad sweep around the margin of Regents Park, with the canal providing a view for a line of clumsy but impressive stucco mansions. Columns and domes proliferate - and while it's all done in the spirit of Nash, it has little of the style and grace his park villas provide to the area. The rain holds off a little and I can slush through leaves with the umbrella holstered for a while here, finally surfacing at the edge of the park where it meets Primrose Hill. My destination here was canal related - heading along the eastern fringe of the park via Prince Albert Road, following a long-deleted branch of the waterway which dived in towards the city. Now, the Feng Shang Princess dominates the junction - a bright red oriental-style boat turned restaurant which is anchored in the tiny inlet which was once the Cumberland Arm. By the mid-19th century, this branch built to serve Cumberland Market and the New Road was described as "no better than a stagnant putrid ditch", a haven of cholera-riddled boat dwellers. Later in the century it picked up the moniker of Jew's Harp Basin after a local public house. By 1941 though, it was filled in - used to absorb the rubble of the bombed city, its waters drained to feed fire-pumps. However the bridge remains, crossing nothing at all, but still adorned with elegant lamps and showing a distinct uplift in the carriageway of Gloucester Gate. I scouted the four pillars, looking down into the void below the road. North of the ghost bridge, the green edges of nearby London Zoo's overflow parking slipped away into foliage. To the south, trees and temporary buildings filled the view. The land beyond had been repeatedly and comprehensively redeveloped. There was nothing of the canal to be seen. I'd planned to retrace my steps here, but a glance around the junction had suggested that there might be somewhere to find food and conveniences here, so I wandered away from the canal. A mile or so later, I found myself in the midst of Camden Town and still no nearer finding what I was seeking. Camden was rammed with tourists ambling pointlessly, pointing cameras at everything, crowding on pavements and preventing walking in a straight line. A drizzle fell, but no-one walked faster. No toilets were open. Stores which usually had bathrooms had opted out - trying to squeeze every bit of retail space out of the tiny Camden shopfronts. After reaching Camden Lock, prematurely finding myself back at the canal having cut a huge corner, I turned and headed back. It felt like a long, wet and miserable slog back to Cumberland Basin, and I began to doubt the sanity of doing this walk today.

Back on the canal, things improved a little - even when it rained, the cutting shielded me from the worst, and I fantasized that maybe if there was a convenient bush I could just go native. There was never the right alignment of foliage and passers-by however, so I trudged on miserably towards the very place I'd just visited. Soon the familiar outline of The Pirate Castle came into view, and beyond it, the canal opened out to accommodate Camden Lock. I crossed the bridge here on the basis that the southern bank looked like a more likely source of sustenance and relief - and paid the price. I was soon left with no option but to climb back up onto the street, just feet from where I'd been standing a little while ago. In my momentary confusion I made another error - not realising that access to the north bank was via the archway leading into the market. Instead, I re-routed north, between the arms of the North London Railway and along Castlehaven Road. The land between the canal and the road was a muddy building site, the egg-cups of the former TV-AM building just visible marking the line of the canal. The towpath was, unknown to me, between the two and perfectly accessible. However, perhaps this diversion was meant to be, because as I prepared to pick my way back down to the canal at Kentish Town Road I noted the entrance to a vast Sainsbury's store just metres away. I practically ran the last few yards into the cathedral of retail...

Back on the tow path, somewhere in the midst of the long straight section leading to St. Pancras Lock, I sheltered under an overhanging walkway and reflected on my day. I was wet, a little tired of the wind and rain, but finally felt comfortable to press on. Walking the canal had felt like a safe November option, never quite leaving the comfort of Central London - but I should have known from previous walks that the water is sometimes a world away from the streets around it. Certainly in Camden I'd felt the jarring discord - quiet green water versus busy streets above. I also felt like I'd been set back by well over an hour by the various diversions, and I began to feel pressed for time. Moving on resolutely, I entered the redevelopment zone of Kings Cross Railway Lands. At St. Pancras Lock, the railways edge in to mark out a blighted zone which has always been industrial land. But slowly, and not without some confusion, it appears to be changing. A huge gasometer beside the towpath will house a new residential building, and the space around it is landscaped and stepped up to a public square. Quaint boats act as book stalls and coffee shops, and the canal benefits from a long stretch of floating towpath whilst the work continues on shore. Clanking around the curve, assuring myself that this was solid enough to carry a now steady traffic of people, I thought of St. Pancras Old Church, not far away here - and the fact that this was probably the closest I'd get to the centre of the city all day. There was still so far to go, and this had seemed like an easy option? Soon enough though, I was forced back to street level by Islington Tunnel - the long, dark void stretched away under Muriel Street, a tiny speck of distant light the only hint of what lay beyond. For me the route meant taking to the alleyways of Islington, diving between the radiating northbound streets and finally emerging at The Angel on familiar ground. A quick crossing of Upper Street, and I'm again in the backstreets and paying respects to the line of the New River at Colebrooke Row. Thinking back to a walk here long ago, and the more recent Olympic jaunt, I found myself reminiscing - so much had changed, but the canal was a constant.

Back on track at the tunnel's eastern portal and with the rain mostly holding off, I widened my stride for the more familiar section of the route through Hoxton and Shoreditch. I'd walked this way before, and knew the risks: cyclists and joggers, in surprising numbers, frequent this part of the path. I tucked myself into the wall and put my head down, slithering carefully over the stones when the path dropped at locks. My feet were sore, and I was soaked through - not ideal walking conditions - but the silvery skies didn't signify immediate rain and the going was more pleasant here. I ticked off progress by basins - City Road, Wenlock, Kingsland - paying little attention to anything beyond my immediate path. Little businesses had cropped up here and their exploiting the busy path, but mostly it was me, walking steadily, with a successing of dinging bicycle bells the only punctuation. This was much, much better. Soon - and rather surprisingly the gasholders of Andrew's Road were dominating the view south, and I felt relief. Whilst there was still a fair way to go, this was the part of the city I felt I knew better. The canal-based businesses here weren't trading much today, closed up with little wisps of smoke coming from their chimneys despite the passing walkers and cyclists. Passing under Mare Street marked a boundary for me - I was back in territory I could navigate easily. Victoria Park beckoned, and a welcome rest on a drying bench near the boating lake. I recalibrated myself, drank the last of my supply of water and wondered if my feet were really up to this last push? It was later than I'd planned - and I still had one little side-trip to complete. Reluctantly I eased my knees straight and started walking towards the Old Ford gate.

My ambitious plan to include a side trip into Meath Gardens seemed ludicrous as I slogged along the path through Mile End Park. The former cemetery had figured in my recent reading, and I realised I'd never really been into the park. Access now was via an elegant, curving footbridge which lead into a development of new apartments around the edges of the park. Soon, I was level with the railway line from Liverpool Street, crossing the canal nearby. The view was surprisingly good - north along the green line of the park, to Wennington Green where Rachel Whiteread's 'House' so briefly stood, and south towards the Thames, the glowering silver towers of the Isle of Dogs dominant. As I scuffled into the park I was startled by a weird dummy posed oddly on a balcony of the new flats. I stopped sharp and my foot twanged. Any hope of an exploration of the park was scuppered. This was now an endurance test. I headed back over the bridge and descended to the towpath for a last, desperate push towards the river. This stretch of the canal is interesting but somehow unrelenting - the north/south geography of the City is exchanged for an east/west axis and the canal cuts, serene and still, across this. For much of the route, work to repair the waterway meant it had been drained to a trickle, and it was both disturbing and interesting to see the detritus of the canal bed exposed to the world again. When I thought of some of the horrors which this stretch of water had endured, I wondered about the apprehension of the workers as the levels started to fall. Just what they'd find a total mystery.

In a sudden burst of sunshine, reflected back at me by the nearby pyramid of One Canada Square, I burst out from under the narrow bridge walk-way into Limehouse Basin. The ending was fittingly quiet, and I sat on a nearby stone bollard trying to lift one foot at a time off the cobbles. I thought about circling the basin and heading for the river, but my feet just weren't up for that kind of additional, ambitious jaunt. Instead I rested, then headed for Commercial Road where I knew a bus would take me to dry seats, coffee and rest. This walk had seem innocuous, a re-linking of past trips and a fairly sensible distance when I set out. What I hadn't perhaps appreciated was the need to deviate from the solipsism of water just to get the job done. The dispiriting walk into Camden and the unnecessary diversions were of my making, but the canal imposes these fractures on the walk too. Perhaps the real folly was trying to walk from West End to East End like this, so brazenly challenging the city's own rhythms. In any case, I felt like I'd achieved something in just staying the course. This was likely to be my last walk in the city for a while, and once again London had challenged me.

You can find a gallery of images from the walk here.

My discipline in planning these excursions had slipped I thought, as I looked at the locked gates of the Hammersmith and City line platforms at Paddington. I thought it again as I stood at the bus stop a few minutes later, realising the 205 wasn't coming and having it confirmed by an overheard conversation from a nearby TfL official. I finally clambered aboard the Rail Replacement Bus - just like I had a couple of months back - getting deposited a short walk from Baker Street station. The weather had also failed to cooperate so far with a thick mist descending during my journey to London which had only deepened once I'd reached the city. I finally emerged at a busy, fractious Kings Cross station, queueing to get an onward ticket to start my walk. Crowds were arriving early for the Rugby match later, and there was an edge of concern at the potential result. Only a day of tourist activity and drinking could put these worries to the back of their minds it seems, as every food, coffee and beer outlet was already jammed with white shirts and red rose emblems. I spotted a suburban service leaving in a few short minutes, and taking advantage of the much easier to navigate new station, soon found myself a seat on board. The train shuddered into life, lurching into Copenhagen Tunnel and steadily edging north to Finsbury Park where a fairly large crowd joined. As we left I noted a blue, metal bridge crossing the tracks, calculating that I'd be crossing at this point later if all went to plan. Beyond this, the dips and valleys of the northern slopes were hidden by mist, only occasionally punctured by cranes marking new developments. I was heading for the Northern Heights today - and I had been promised wondrous views across the city. I rather doubted these would be forthcoming...

I had been fascinated by the Northern Heights branch for years - even the name suggested something special, something rather European perhaps? I'd pored over maps of the abandoned line, and viewed endless images of the route - both in its heyday and afterwards. It was a surprising story in some ways - many surprising London Transport projects have progressed to fruition despite their costs or complexity. But this one - to take a branch of the joint GNR/LNER leading to the terminus at Alexandra Palace and incorporate it into the line to Moorgate - was scuppered early on. The branch benefited from a steam service to Kings Cross and North Woolwich between the wars, and despite a decline in ridership, the chance of decanting brokers and businessmen from the increasingly salubrious suburbs of Crouch End and Muswell Hill directly to the city was surely a winner? Work began, the ironwork to support the electric cables was erected, conductor rails laid - the line curved south and west from the Palace, linking to the Underground at Highgate where a substantial surface station remains even now, then turned east towards Finsbury Park, flying over the mainline station and descending to join the branch to Moorgate. Then war broke out and the project was mothballed. Steam services rather surprisingly began again in 1945 - but in a half-hearted fashion. Coal shortages followed, the branch was cut back to a shuttle service to Finsbury Park, and eventually closed in the 1950s. The rails remained in some sections until the 1970s to facilitate the transfer of Underground stock between lines, and it's perhaps this which prevented the land from being annexed by developers early on. By the 1980s the campaign to preserve green spaces was more vocal, and much of the line became The Parkland Walk, reputedly London's longest park. The wooded margins of the line were left to grow around the well-intentioned signs erected to encourage pedestrians. By the time I began my curious interest in the Northern Heights it was a green snake in the suburbs, a curious absence on the map which, to perhaps only the trained and curious eye, denoted a former railway alignment.

I found myself at a misty Alexandra Palace station, buying a coffee from a busy cafe/flower shop combination called The Yard. Outside, visibility was down to a few metres and the suburbs were wearily recovering from their Saturday morning hangover. I crossed the footbridge and set out towards the Palace. Seeing a track leading down into the park, I set off. The path was besieged by joggers and dog-walkers who, it seemed, weren't entirely comfortable with each other's presence at all. I saw a number of minor altercations as dogs decided that the heavy-breathing runners decked out in their serious lycra wanted to play and irritated owners hauled their panting companions off. However, both the joggers and the dog-walkers could unite when it came to cyclists, who were a common enemy. No-one rang a bell out here in the suburbs, they felt their entitlement strongly and weaved crazily around obstacles - human or canine. It was during the fascinated watching of this minor conflict that I realised I'd already taken a wrong turn. Looking up the steep rise to my right, I could see the vast antenna of Alexandra Palace rising from the building, disappearing into cloud. I turned for the building, realising that this walk would feature something absent from my usually water-based wanders - hills. I slogged up the bank, dodging impromptu streams which trickled down the slope, my hip complaining and out of breath. I felt completely out of shape and out of practice as I met a gent on a single crutch hobbling down the steps from the Palace. He chatted amiably about his walk, how he had used the crutch for so long he thought he'd forgotten how to walk without it. I felt ashamed of my groaning at the hill. Moving on, I skirted the front of the Palace building. Still an active venue, the place is in a range of states - some parts looking fit to collapse at any moment, while the grand hall could still be in its prime, with only the more cosmopolitan tastes reflected in the closed-up Sushi and Thai food concessions around the hall's perimeter giving away the century. The grand Palm Court entrance gave way onto a yard, now full of hospitality tents. I poked my camera into windows and tried to get a sense of what was inside, but the building was resolutely closed today. I set off, downhill and westwards, trying to gain the path of the railway which emerged from a now-abandoned but still extant station at the north of the Palace site. Briefly, the line was clear in the level course of a path between trees, but it was interrupted by a fenced entrance to a Health Club. I headed across the curve of the Palace driveway, emerging into Alexandra Park. I tried to remain faithful to the railway, skirting the northern edge where I could as the path snaked around a little café which seemed well-patronised despite the gloom and mist, mostly by cyclists, resting their steaming lycra. The path regained the railway alignment here, disappearing under the road at what was clearly once a bridge now filled-in to offer a typically narrow urban underpass. Above was Muswell Hill - where I'd had a vague plan to start this walk before deciding to extend east to Alexandra Palace. I didn't feel any need to explore the area - there was a path to walk ahead, with the first taste of railway arcana evident in the presence of some of the iron railings which would have supported the electricity supply cables which never quite made it this far.

This first section of the Parkland Walk (North) as designated by the London Borough Haringey takes in the broad sweep west which the line took to reach Cranley Gardens station. Curving high above the suburbs on a broad brick arch, the views to the south are said to be noteworthy. Today, however, the valley was a sump of cloud with only some relatively nearby modern office blocks peeking through the carpet of white. Looking north, the spire of St. James Church loomed ominously among the redbrick villas of Muswell Hill. I walked on, still dodging joggers and cyclists. I revisited my casual survey of cyclists use of bells - on the towpaths in the east a merry ding was fairly common to warn of a passing hazard, but north and west of the city a reluctant grunt was more likely. Those passing today did nothing to buck the stereotype. As the path began to turn south, the trees closed into a tunnel overhead and I was reminded that this wooded slope down to the Thames had been forest until relatively recent times, and this quiet path had quickly reverted to type once the railway was taken up. Rather suddenly, the path opened out to reveal a brick overbridge, the hum of traffic drifting down to the path signifying a fairly busy road. Passing under the bridge, the footpath forced an ascent back to road level. The trackbed immediately east was built on, blocked before it swung around the edge of Highgate Wood. At street level now I had a choice - the suburban delights of Muswell Hill Road or a walk through the woods. Perusing the notice and map at the gate sealed the deal - at the heart of the woods was a café and toilet combination - beloved of Local Authorities everywhere, and so often closed - but it was worth a punt. I set off into the deep, mossy woodland of ancient trees. Quiet descended immediately, and voices travelled eerily far within the woods. I heard a distant group of children playing before I saw them, and could hear - but not understand - every word of a 'phone conversation of a French woman on a bench a fair distance away, as she smoked herself into a lazy stereotype. I plunged into the heart of the park, circling the Corporation of London facilities until I found the wonderfully spick and span Gents toilet. Much relieved I headed back out to the edge of the park which skirted the road. My instinct had been to hug the curve of the railway but the sign was clear "Abandoned Railway - No Public Access". Instead, I headed for the point where the road converged with the former railway at Highgate Station. The walk was cool and pleasant - an antidote to the close, misty fug outside the woods. I enjoyed the strange sense impressions of being in woodland within a city for a while before I found myself at a convenient exit onto Muswell Hill Road. The road curved slightly uphill here, and a queer little block of haphazard white cottages filled a gap in the otherwise deeply typical North London street scene. The centre cottage had a blue plaque reminding passers that Peter Sellers had lived here as a boy. In fairness, he hadn't stuck around long - and after finding early success he'd headed uphill and upscale to nearby Highgate - but it was a sobering reminder that these properties which now shift for well over half-a-million were fairly humble in origin. A little way on, a confusing mess of traffic lights and pedestrian crossings signals Highgate - or at least a stretch of the A1 which is not quite Highgate and not quite Archway. A mixture of low-aspiration chicken shops and higher-spec bars, the area seems a little confused and transient. Highgate Station is a strange anomaly - one of the deepest tube stations on the network, topped by a fairly extensive and surprisingly intact surface station that used to serve the Northern Heights line. There are a couple of reasons for its survival - firstly, its a fairly solid concrete structure that is integral to the sub-surface part of the station, and secondly even the parts of the station above the ground are nestled at the foot of a deep chasm here. Access to the ticket hall for the underground is via steps or escalator from street level to a concourse immediately below the former surface station with one of the small car park areas overlooking the former platform canopies. Thousands of people catch a glimpse of the former station as they pass each day, and I wonder if any of them ponder the history of the place? I'd like to dwell on the station a little, get a good picture perhaps - but it's evident that this is going to be a frustrating exercise. The site is closed off and the official route busy with people. The station is just inaccessible enough to be tantalising. Instead, I walk a little way along the street to get a drink at a newsagent, before turning back and dodging into a side street - it was time to find Parkland Walk (South).

The southern section of the linear park is remarkably similar to the first, if a little longer and more regularly crossed by other routes. As the line descended the slope from Highgate towards Finsbury Park, it curved eastwards, cutting across Crouch End where the station platforms remained intact. I decided to walk along one of these long-abandoned platforms - the route was still busy, and it would at least get me out of the path of the cyclists for a time. Hemmed in by trees, it was quiet and oddly rural here, while over the embankment the suburbs were beginning to turn into the perma-highstreet of outer London radial routes, with their endless fried chicken shops and encroaching Tesco Metro branches. Here though, all was green and still. I paused a moment to regard a carving of a woodland spirit or Spriggan, clambering menacingly down from a brick arch. Perhaps this sylvan guardian keeps the real world at bay in this little nook? Beyond the station, the line crosses a multilayered intersection at Stroud Green - beneath it the suburban Stapleton Hall Road, and further beneath that the Gospel Oak to Barking Line, ploughing east towards Harringay Green Lanes, with the tight curve onto the East Coast Mainline evident in the near distance. This is a signal that I've almost completed a circle now, and I move on towards Finsbury Park. Here the parkland walk ends rather inauspiciously in fact. No metal archways like the Greenway or Ridgeway, just a choice - a slope down to the road or through a kissing-gate and onto the blue metal bridge over the railway which I'd spied earlier. I took the bridge which deposited me at the edge of Finsbury Park - and I realised I'd never been here. Well, I'd been to the place called Finsbury Park, and indeed the station which borrowed its name - but I'd never visited the park save for a bus journey skirting the eastern edge. With the pathways uncertain, I struck east and tried to cross the unfamiliar park. The way was blocked by a playground and a lodge, converted into a closed art exhibit, but I finally found myself cresting the rise and crossing a wide expanse of open grass towards the road. Now I was at a point of decision. My entire purpose today had been to walk the Northern Heights line - it was a walk I'd long set-aside, and it felt good to have done it. But what would I write about? What would be the defining theme or moment of my walk? I realised that - despite most of my ramblings being mere descriptive text, they all had a hook. This had none of that - it was a pleasant suburban walk that echoed the same experience of all of those joggers and cyclists. There was nothing special about a trudge along a North London footpath, was there? Feeling a little dejected I plunged into deeper suburbia, and with it, the London Borough of Hackney.

Hackney has always intrigued me - a nexus of opportunity and corruption, of commonplace London life and strange mysteries. I doubted that this fission of normal and strange would produce the goods today, but it was with an open mind that I zigzagged through the backstreets of the deleted suburb of Brownswood Park, heading for water. That was always a good plan. After its arrow-straight and pedestrian-unfriendly progress through the backstreets of the Harringey Ladder, the New River starts to meander crazily towards Islington nearby. One of these broad loops edges around a pair of reservoirs which I had largely ignored on my map until thinking of this walk - so I tramped a short section of Green Lanes southwards to the strange Castle Climbing Centre. This curious Victorian edifice is a folly in part, but was built with a purpose - housing two giant steam pumping engines - the Lion and the Lioness - connecting the New River and nearby filter beds. Now the castle houses a centre dedicated to dangerous sports, with an impressive set of disclaimers and liability dodges posted before you even enter the compound. Nearby a shop fixes bikes beside a boat club, a string of cyclists with their upturned machines lining the path. The ghosts of the whole New River enterprise are never far away - a public housing estate across the street named Myddleton Close ensured that the forgotten river was celebrated in civic terms at least. I turned aside to cross a small bridge and emerged from the trees to see the sweep of the West Reservoir with the narrow New River curving around it. As a string of canoes paddled towards me I knew I'd found my route at last. The river path was quiet and refreshingly cool - welcome, as the day had stayed misty but become humid as the sun rose behind the murk. Across the reservoir, I could see a trio of tower blocks that drew me eastwards, following the path around the reservoirs. Somewhere along this path, I crossed a strange threshold, which at first I didn't register - the rough track turned into a broadly sweeping, well-surfaced pathway, with neat benches and trimmed grass at its edge. The buildings changed too - from the red-brick 1930s built social housing blocks into the grey panelled, glass-fronted apartments which are ubiquitous around the encroaching fringes of the city. I had entered Woodbury Down - or, to provide its modern rebranded name WoodberyPark. I didn't know this place at all, but it felt odd - like a sliver of the Olympic Village laid down in the midst of suburban Manor House. Impressive water features - utterly unnecessary in a place surrounded by beautiful lakes and a curving man-made river - tinkled in the background. There were information panels on the wildlife and flora. This felt very, very strange. Lordship Road bisects the two reservoirs and appeared from my ancient maps to once have provided something of a centre to the area, with a busy string of shops and businesses. Now the narrow channel is an exhibition of traffic-calming measures, hemmed in by tall apartment towers. At the foot of these are the traditional amenities of a housing project - the post office, a hairdresser, a corner-shop - squeezed into small 'business units'. There was also a surprisingly well-stocked Turkish supermarket offering baked goods from which I purchased generous helpings of carbohydrate. Crossing the street into another neatly planted zone near a complicated-looking children's play area and a 'nature zone' I sat and pondered Woodberry Down - and while I ate I turned to the internet for an explanation...

Woodberry Down was, it turned out, the subject of one of the largest and most expensive regeneration plans in Western Europe. I'd stumbled into a zone that had been marked out for what was unflatteringly described by some as state sponsored gentrification. Like many such areas, its history was noble - a model social housing scheme conceived to alleviate slum living and built to a relatively high standard for its time. The mix of low-rise housing and mid-rise, typical local authority blocks clustered around the river and the reservoirs, nestled in a curiously quiet nook of north-west Hackney, far from the bustle of its traditional centre. In fact, it was quite a way from anywhere - and despite the presence of Manor House station on the edge of the zone, it was always somehow disconnected and separate. The social and political consequences of placing a vast swathe of public housing here - no less than 2000 homes at its zenith - were not important. The need was clear, so the job was done - houses built for those in need to Herbert Morrison's masterplan: taking land formerly inhabited by sprawling suburban mansions and dedicating it to public use. The inverse of gentrification perhaps? The story is familiar from there on - the London County Council is abolished, an impoverished and corrupt Borough neglects its duties, the estate becomes an ill-maintained sink of unlettable properties, its population an uneasy mix of long-term local residents and transient people from across the borough desperately in need of housing. The social problems escalate in inverse proportion to the decline of the fabric. By the 1980s, Woodberry Down was infamous and mostly unvisited. Its spiralling drug problems marginally troubled the Police, but largely prevented their intervention in local affairs. The blocks crumbled around the loyal residents who clung on, part of a community if nothing else. The cry that 'something had to be done' turned into a long-term vision that saw Hackney's councillors ride the wave of private capital which was sweeping the City. The stock sold, a developer and housing association engaged, and a masterplan for a long, slow redevelopment of the area proposed in attractive but hazily provisional drawings. The worst blocks would be replaced first, the residents decanted and replaced in like-for-like social housing 'units', but some blocks would be sold commercially to provide a return on the investment. It was a commercial and political win-win. The program started a slow march through Woodberry Down. There were delays and changes, of course - it was a hugely complex task - but the changes soon took on a worryingly familiar theme. Suddenly, the commercial blocks were promoted in the running order, and those nearest the waterfront were redesignated to be sold rather than let. The river's edge walk I'd just made along the brochure-friendly sweep of glass and granite blocks was meant for overseas investors, not the locals. In the large tower fronted by the water feature, upper floor apartments sold for £1.3m. This was now private land, compulsorily taken, given back to the public, now retaken to be sold to let. Regentrification. A real-estate soap opera. A little way along the river path, it abruptly ends at the foot of the last refurbished block so far. Large slabs of crumbling apartments with boarded windows march east, backs to the new builds, the neat pathway giving way to a sandy, rutted track. A couple bump a pram along the grooves heading for home. This is the real Woodberry Down - or at least what is left after the carrion has been picked over by the developer. At this point I felt a little ashamed - I'd been hammering on about events east of here for years, and in housing terms at least, the Olympic scam was a perfect microcosm of this issue at work. Here though, many thousands of people's lives were being changed by a grand scheme dedicated to offshoring maximum profit. The people I felt perhaps most empathy with were those who hadn't yet had the developer's eye turned on them - they waited. It could be three more years, or it could be never. The promise of a decent home, underwritten by Hackney Council, supported by the sale of the private elements of the scheme seemed more like a gamble with uncertain odds.

On the bank of the New River, looking south across the misty expanses of water I brooded on this scheme. I found myself shaking with anger at the failure of my fellow public servants to deal openly and to hold capital to account. A rare political aside here: I fundamentally think that public and private together are the right way to do this stuff - indeed maybe the only way now. But the failure of Boroughs to manage these huge commercial deals effectively means they get trampled under the slick presentations and scary numbers peddled by these huge corporations. The Mayor of London seems to have the right idea in principle, the Councils talk a good deal too - but on the ground, again, people are suffering the consequences of officials losing control of projects. Over the last four decades, the lot of the public sector has been a poor one, often divorced from reality and drawn into cul-de-sacs of political correctness and ill-thought-out, credibility sapping spending sprees - it's time to recover our wits and become part of the real world again. Woodberry Park could have become a very different place if Hackney had believed their own hype and this was genuinely a partnership - but it isn't - it is an abdication. I left the estate, haunted by a quote from one of the agents selling off-plan properties here to an investor who came to see this place:

Later, Dhimi recounts how a client bought an apartment here off-plan from one of those hotel suites a world away. When it was finished, he drove her directly from Heathrow to have a look. "As we got closer, the surroundings got rougher and she went quiet. And when we arrived she said: 'Dhimi, I can't stay here: put me in a hotel.' The next morning she wanted to sell up. Immediately."

I was beginning to feel footsore when I found my way onto Amhurst Park and started the turn southwards towards more familiar ground. The mist had begun to lift a little and there was a weak but warm sun breaking through as I passed over the railway line at Stamford Hill. Groups of Hasidic men wandered home in shtreimel and rekel, talking and gesturing with varying degrees of merriment and seriousness as they went. The street was busy with life, which was a relief after the near silence of Woodberry Park. At the busy meeting of ways at the centre of Stamford Hill I turned south onto the A10 - the long, straight drag leading directly into the city. It was dry and dusty, crowds of shoppers waiting for delayed buses, casual anti-semitism uttered on sour, lagered breath. I needed to be near water to complete my walk, and I felt the pull of the River Lea again - the marine parallel of this dreary road south. After pausing outside the gates of Abney Park Cemetary to rest my feet, I turned east, staggering my progress via suburban streets and narrowly avoiding Kray connections on Evering Road. If this was gangland, it was curiously quiet and leafy today with no hint of menace behind the net curtains and CND stickers in the windows. My next encounter with civilisation was at Clapton, zig-zagging across Upper Clapton Road to dive through the Southwold estate to the river. Again, I recalled the reputation of this long, southbound main street - once the fringe of Hackney's 'murder mile' but now bookended by gentrification - there was more chance of taking a NutriBullet in Clapton now. The sun was at an afternoon high as I began the gentle descent to the river. The owners of the small, provisional and oddly half-empty corner-shops of Southwold Road were out front, enjoying the hazy warmth. Kids played in the street noisily. Occasional raised voices leaked from inside quiet homes. At the foot of the hill, the street opens into Millfields Park with direct access to the Lea. Despite being tired and sore, I picked up the pace, eager to reach the water. I realised though that something had changed. The horizon was unfamiliar - the flat, empty bulge of Essex Wharf across the water now home to more of the anodyne apartment blocks that are appearing all along the river. These seemed very new - beginning to be inhabited, but surrounded by unmade ground with exposed pipes and builders detritus. I snapped a picture to compare with my 2012 view as cyclists dinged by. I had been away from this path for far too long it seemed.

My walk south was essentially a reversal of a long-ago excursion made just weeks after the Olympics ended. The world here is different now - but not wholly. Crossing the Lea Navigation just south of Lea Bridge Weir, I pass the entrance to the Middlesex Filter Beds - still quiet and green, still a monument to long-gone municipalism. My legs feel like stone, and I plot several escapes via bridges and bus stops - but none of them really appeal. I want to unwind this walk all the way to Bow Church. As I pass the now unfenced edges of the Olympic Park I notice they are still officially closed while planting takes place. Some of this land has been inaccessible for a decade now I noted as I skirted the 'soon to open' Here East buildings - fronted by the former the IBC/MPC block. Oddly, once I've passed the stadium at Old Ford Lock the towpath feels unchanged. Still overhung by trees and collapsing warehouses, paving slabs still clunking underfoot. The cement works loom over the path and there is little to give away what has happened here over the last ten years - except for one tiny hint in some graffiti on a crumbling brick workshop which somehow has survived: "ODC Domain". I clamber up the bridge at Bow Roundabout, tempted to press on under the junction via a yet-to-be-walked sliver of towpath - but it's now a little late in the afternoon, and I'm incapable of taking more than tiny steps ahead. My knees are locked tight and my hips hum with a vague but persistent pain. I've walked well over twelve miles - and somehow in the midst of terrain I feared would be faceless, anodyne and suburban I found both anger and inspiration. Trying to describe this feeling, the sense of dismay at lost opportunities and the flash of anger at the greed and stupidity of local politics I recall the words of Iain Nairn, standing in a ruined Lancashire pulpit: "It makes me BURN".

It had been a busy month of excursions already, and it was impossible not to suffer the slight financial disquiet which always seems to ensnare me at such times when faced with the prospect of a weekend in London. But it had been a while since we'd ventured up here on a joint visit - and when some very old friends from the US had announced they would be in town, it turned out to be possible to extend one of my now regular monthly walking trips to ensure we got to meet up. In fact, things had taken an even more fortuitous turn a week or so beforehand when we spotted that Iain Sinclair would be speaking at the Design Museum during the morning of my trip. After a good deal of prodding and persuasion which is always necessary to get me to spend money on what my unconscious anxieties deem a luxurious non-necessity, I quickly reorganised things, booked a ticket and shelved a planned walk until the next trip. The Northern Heights could wait for a while.

I set out early, leaving a pleasantly autumnal morning at home and finding myself in a damp, mist-shrouded city. Surfacing at Tower Hill, the top of the White Tower was above cloud level and the ever-growing city skyline seemed to loom weirdly out of the mist. I realised I'd need to brave the rain to get to my destination, and decided to strike out for the south bank right away. Strangely, I realised that this would involve my first ever crossing of Tower Bridge. As I wandered under the vast towers I tried to mentally catalogue my walks in this part of the city, but I could genuinely never recall crossing the bridge by any means. It seemed impossible, but thinking of the focus of my walks over the years it was entirely likely. It became pretty clear that I didn't know my way around this part of the world when I got to the southern shore. I knew the Design Museum's location due to a very recent walk which ended near here, but it still took me a while to figure that the only way down to the embankment without a long detour were the stairs in the middle of the footway. Once beneath the bridge, I ducked around the corner into the tall warehouse blocks of Shad Thames, finding a spot to get coffee. I was experiencing all the usual apprehensions of attending an event like this - the sense of intellectual inadequacy, the oddly proletarian fear of not 'acting right' in a cultural venue. I shook it off as far as I could - I was going to hear perhaps my favourite living writer speaking for the first time since 2009. Eventually I managed to administer the necessary internal slap to get myself moving, and headed for the Design Museum. Handing over my ticket, I realised I was probably the first one here and found myself directed upstairs to a gallery curated by the Spanish footwear company Camper, entitled Life On Foot. I browsed the exhibition for a while, savouring the shoe-shop smell I'd experienced as a child but have studiously avoided ever since. It's clear the brand is irreverent, innovative and interesting - but to be brutally honest, their line in bright, casual shoes wasn't my thing. I looked at my dusty but much loved walking boots - possibly the most I'd ever invested in footwear, and silently thanked myself for overcoming the urge to save money just that once! By far the most interesting part of the exhibition was the section on new approaches to walking the city - it was here that Iain Sinclair's involvement had been secured, and his work sat alongside other attempts to alter the walker's view - including some neat 'games' involving technology and walking. Alongside this, under a crazily-angled roof beam sat about twelve small chairs. This was going to be an intimate occasion it seemed.

The talks began with Peter Watts describing a Twitter-guided excursion from the Design Museum. In short, he let his followers direct the action at each decision point, and wandered according to their whims. He talked a lot about method - should every junction be a decision point for instance? What about decisions which would clearly create a circle? Interestingly he travelled only a short distance from the museum and ended up back at the river - its magnetism ever present. Iain Sinclair followed with a less structured and more conversational talk given the small audience. He described his pre-digital engagement with the city and compared Peter's walks to Situationist practice, before taking a long, discursive ramble through his recent walk covering the London Overground project, the post-Olympic legacy in London and the privatisation of space he'd experienced when trying to swim in the highest pool in London, buried somewhere high in The Shard. The session was to be followed by a signing, but the small crowd seemed to drift oddly away, so I plucked up the courage to present a very old, battered copy of Lights Out For The Territory, appropriate because it was one of the texts which set my walks on a rather less travelled path many years ago. Iain generously signed the rough old paperback, and given the lack of any other punters indulged me in a short but interesting chat. We parted with a handshake, and scurried off in our separate directions - both with new walks to consider, and old haunts to linger on. I found it a little difficult to settle into the day after such an interesting and challenging morning, and found myself wandering back over the bridge to eat, watching the river and the tourists, before heading for our hotel for the night deep in the City. After checking in I wandered out for coffee, finding myself close to The Monument and the coffee shop I'd used for years on my city jaunts - mercifully still open at the weekends. Checking news from home, we scheduled our meeting in London for later and I decided to strike out on a bus trip east. I was still oddly spooked by my morning, so I didn't wander far, disembarking at Limehouse and wandering the grounds of St. Ann's church for a while, before getting the DLR back into the city for a quiet evening, the novelty of getting to meet up in London not lost on me.

Sunday dawned cool and bright, and I couldn't resist an early wander in the deserted city. I'd arranged to head west and collect our friends at 10, so I had time to do a circuit of the eastern precincts of the square mile finding myself drawn, unwillingly, to the Walkie Talkie building. Recently voted the worst building in London - but on what basis I'm still unclear as there are many contenders now - this odd thumb-shaped smudge on the horizon seems to intrude on every picture of the city, despite not being the tallest tower by some stretch. There is something about its arrogant, bulging presence which offends the eye somehow, not to mention the strange environmental effects its shape and bulk are causing. I circled it, eyeing it critically but honestly. It didn't look like a bad building to work in - but it was hard to ignore it. It will never quite feel like part of the fabric I fear, set aside from the cluster of towers as it is. I pressed on in a loop around Fenchurch Street and back to The Monument for coffee, before getting the tube west to Gloucester Road. The utter change in the environment was a strange shock - from glass and steel to stucco and porticos, I wandered into one of the specific type of hotels beloved of overseas travel agents and met friends I'd not seen for more than twenty years, it was a strange and rather special morning indeed. Wanting to give our visitors the tourist experience, we headed for the Tower via their first Underground ride and a short walk around the city. It was, as ever, crowded and frustrating to get around the attraction, but we covered a fair bit of ground including the obligatory crown jewels and an ascent of The White Tower which involved a lot more steps and stairs than I'd expected. Once we'd seen enough armour - and there is a surprisingly exhausting amount on show - we headed out for a very strange pub lunch in a very busy Fullers' outlet before escorting our friends back to Gloucester Road en route back to Paddington for our own homeward trip.

Reflecting during the trip home, I realised what a complicated relationship I have with London - tourist, walker, reader and writer of obscure little blogs - and how as my friends and family have become a global concern, it has become a canvas for showing Britain's history to them. This weekend I've managed to pack all of these roles into a single visit, so it's perhaps no surprise I felt a little disoriented at times. Next month, thanks to First Great Western's unusually well-timed special offer, my walks will return to their usual pace and solitary nature. While I look forward to wandering far more mundane locales, away from the tourist trail, I'll miss having company on my trek.