Well, this was a comedy of errors, in more ways than one

. Also, I would like to submit a claim for most Park Stations visited with rules of Park Challenge (external visit with camera snapping at station), and a second claim for most bus routes used. No idea whether these hold, though.
Started at
Belsize Park (snap) about 10 seconds after Nick and 10 minutes after Andi, Kev and Nozza. Seriously overestimated the time it would take me to run down 189 steps (left one and a half minutes, took about 30 seconds). First train to Camden Town limped into the platform - as you might expect, this was a portent of things to come. Went down to Camden Town with Nick and tractakid (who decided to do 4 park stations this time), where I missed my connection. Never mind - I built slack in for one missed connection. Train to Woodside Park, with a great 2 minute connection at Finchley Central for a Mill Hill East train! Not going there today, so on to
Woodside Park (snap) to find a second missed connection, and hope for making the 4 to Finsbury Park pretty much straight out of the window. To add insult to injury, my travelcard stopped working (error 09, due to demagnetisation).
Got on a southbound train for a 2 minute connection at Finchley Central for a Mill Hill East train! Not going there, though, so onwards to
Tufnell Park (snap), where again the travelcard did not work (as expected). This was where I left Nick and tractakid, who decided to wait the 8 minutes for a number 4 while I tried a 390/29 combination via the York Way/Camden Road junction. This was not very successful, mainly down to crowds of people attempting to board all the way up Seven Sisters Road. Straight on a train at
Finsbury Park (snap) to Blackhorse Road, where I managed to get my travelcard replaced, though I had an unfortunate encounter with Error Code 42. Buses caught so far: 2.
Leytonstone High Road and a W14 appeared as I reached the high road to get me to Leytonstone, an epic 2 stop time-saving journey - but unfortunately not enough to make a Hainault via Newbury Park whose doors closed as I arrived on the platform. 5 minutes for a Woodford via Hainault (what else!) to
Newbury Park (snap). Informed the people giving out stuff outside that there would be more of us taking pictures, then ran through the subway to board a waiting 66 bus for one stop to Ley Street - and there was a 169, waiting on the northern side of the A12! 6 minute wait at this stop for the bus to advance across Eastern Avenue, then onwards to Barking. Straight onto the District Line to
Elm Park (snap), lovely doubleback to
Upton Park (snap). Buses caught so far: 5.
On to West Ham, Jubilee to Westminster (where I stupidly got lost), on to
St. James's Park (snap). Back onto the District, change for the Victoria at Victoria snappily up to
Green Flipping Park (snap). Got out and on board a 22 to
Hyde Park Korner (snap), where I ran around like a headless chicken cursing Winter Wonderland, then ran to Knightsbridge straight down the A4, dodging the stationary cars. Double-backed HPK, then Earl's Court and
Wimbledon Park (snap), where I met Peter Smyth. Stayed together up to Earl's Court, Hammersmith (on the Picc), run to
Ravenscourt Park (snap), District to
Chiswick Park (snap), 440 bus down Bollo Lane over two level crossings, then run up the road to
Mill Hill Park (snap). Piccadilly to
Park Royal (snap), run to Hanger Lane, Central to
Holland Park (snap), where Peter ran off to do the Ladbroke Grove run. Me? I had another station to tick off instead. Buses caught so far: 7.
Back on the Central Line to Oxford Circus, onto the Bakerloo to
Regent's Park (snap). Run across to
Great Portland Street & Regent's Park (snap), to catch a H&C to
Westbourne Park (snap). Out of the station to find the bus stop out of action, so ran up to Harrow Road for the next one, where I got on board a 31. The driver was surely both suicidal and homicidal, with the way he charged through 3 red lights, almost ran over two people and a 36 bus was forced to reverse hurriedly out of his way, but he made the trip in 9 minutes to
Kilburn Park (snap). Up to
Queen's Park (snap) on a terminator, LO up to
Stonebridge Park (snap). At Stonebridge Park, I went out to take the photo, back in towards the platform, then back out to buy a drink when confronted with a 4 minute wait from the newsagents outside, then back in again to catch the Bakerloo Line. This meant I triggered Error Code 41. Buses caught so far: 8.
Up to Kenton, run to
Northwick Park (snap). Since Moor Park and Canons Park are about equally far off time-wise, I decide to take the next train. Cue, of course, Uxbridge service, which I therefore leave. Take train after to
Wembley Park (snap), then run straight down stairs onto waiting Northbound Jubilee Line train. Success!! Except I barely jump off in time to avoid a trip to
Wembley Park Siding (no snap, I'm afraid, so doesn't count). Wait for next train, which I take to
Canons Park (snap), then back onto a train to Wembley Park for a 4 minute wait for a Chesham train which crawled up to
Moor Park (snap) for a time of 08:03:59.
Buses caught during challenge: 8
Error Codes seen during challenge: 3 (codes 09 (twice), 41 and 42)
Park Stations Visited: 26
Stations missed: Carpenders Park, Drayton Park, Osterley Park and Spring Grove and Park Royal and Twyford Abbey.