Thanks, Overground. I like your colour, but not that much else. So, here was my route:
Essex Road

Old Street

Bank

Shadwell

Canada Water

Westminster

South Kensington

Green Park

Vauxhall

Clapham Junction

West Brompton

Earl's Court

Ravenscourt Park

Hammersmith

Wood Lane

White City

North Acton

White City

Wood Lane

Royal Oak

Warwick Avenue

Maida Vale

Oxford Circus

Tottenham Court Road

Camden Town

Camden Road

Gospel Oak
If you don't feel like reading an overly detailed report, stop now.
As Nick said, these were fairly innocuous but turned up to be quite challenging!! We started watches at Essex Road at the bottom of the lift shaft, then ran up to the platforms. The first train actually arrived 2 minutes late (as far as I am aware nobody noticed this - I only found out when I checked RTT when I got home). I made a split second decision to bail at Old Street for the southbound Northern Line, which turned out to be neither here nor there - it's a longer run but negates the waiting outside Moorgate for a platform! On the short ride down to Bank, I decided to team up with Sam (Inman) for the challenge - I should really have done more of these rounds solo!!
Charged down the stairs at Bank to find the DLR some distance back along the platform - luckily I made it right to the back carriage (with a number) with a few others; the rest of us got onto the front. As far as I was aware, we were all still together at this point (turned out later that some people had stayed on the Northern Line, A2 being one of them). After brief comments on the absurdity of ending up on the DLR at all, we got to Shadwell, where there was a disaster - there was only one barrier working and a huge crowd!! I pushed through some of the people then took to the stairs, arriving to see a train just opening up its doors. Waited by the doors to hold them in case it was needed, then once my teammate and what I assumed was the rest of the pack had arrived I let them close only to see Richard (and a very brief glimpse of Glen and Eleanor) arriving seconds too late!! And then we were nine, I think?
Bailed at Canada Water with Peter, Tangy and tractakid (the others remained on board) to miss a Jubilee by the skin of my teeth! Onwards to Waterloo, where tractakid bailed (which was the last I saw of him), and the rest of us took to the escalators at Westminster to find 3 minutes for the District Line. Of course, this was actually 6 minutes (TfL minutes, you know), so it was onwards to South Kensington (Tangy bailed at Victoria to get to Knightsbridge the other way). The three of us hurried down to the Piccadilly, where Peter went off to do his own door position (twas the last we saw of him), while we got ready for Green Park. At Knightsbridge, we rejoined with Tangy, and then the run to the Victoria Line at Green Park (it seems Tangy prefers the escalators - personally I'm a corridor man, so much flatter). Onto the Victoria Line down to Vauxhall (after a quick debate on the merits of Victoria and Southern), where after a brief kerfuffle with the platforms we took a South West Trains down to Clapham Junction - only to see both Overgrounds pulling out!! Met A2 on the bridge at Clapham, he was walking in the opposite direction, having just come from the Overground, then settled for the 13 minute wait to head up the West London Line.
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...finally we left. Got to West Brompton for an all right connection onto the District Line up to Earl's Court, then a snappy platform switch onto an Ealing Broadway. Upon consultation with the online live departure boards at Ravenscourt Park, we discovered that while our train might be saying Ealing Broadway, it might end up going to Richmond - and anyway there was an eastbound District ready for us, so we took that. Back to Hammersmith, across the road (not held up for once) then an 8 minute wait to leave Hammersmith.
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...which left bang on time 8 minutes after we arrived. We got to Wood Lane to see something that pretty much killed our spirits right then and there - Kevin, Nozza, Alex, Sam (Smith) and Richard were all waiting to board the H&C we had just left on, meaning they'd just done the North Acton doubleback and were 20 minutes ahead!! The three of us pelted down to White City, where the Central Line was doing a lot of waiting in the platform, then up to North Acton for a quick turnaround and back to White City. We encountered A2 on the way back to Wood Lane (and apparently Peter as well, but I didn't notice him) where sure enough, when the train arrived we were precisely 20 minutes behind. We had a lot of catching up to do.
Off to Royal Oak, where we encountered Andi and Das walking in the other direction. After crossing the road bridge over the canal, myself and Sam took the shortcut, whilst Tangy went the longer way - a decision that saw us finally lose Tangy!! There's some debate about the difference between road bridge and shortcut vs curly footbridge - I reckon they're exactly the same, except I prefer not to have to go in circles to get onto a footbridge. Anyway, up to Maida Vale, snappy doubleback and down to Oxford Circus on a 1972 stock that had the air vents working!! Two sexy changes onto the Central Line at Oxford Circus and then an Edgware branch train at TCR, then north towards Camden Town (being on an Edgware branch meant it was better to run the Camdens (they're closest anyway) than to either change branch and run the Kentish Towns or deal with the lift at Chalk Farm for the Chalk Farm - Kentish Town West run). At Camden Town, we figured we had about 5 minutes to get to Camden Road - which was down to 4 minutes by the time we'd got past the tourists and up the single working escalator. Straight up a reasonably crowded but not packed Camden Road saw us get to the Overground with about 1 minute to spare, and we came in with a final time of 03:20:55 to see Kevin, Nozza, Alex, Sam and Richard on the eastbound platform, having presumably finished shortly before us. So that was that.