Clapham Junction

Streatham Common

Streatham (walk)

(via Loughborough Junction to) Elephant & Castle

(via Stockwell and Clapham South to) Balham

Clapham Junction (again)

(via Wandsworth Road and Queens Road Peckham to) Canada Water

(via Bermondsey to) Waterloo

(through Clapham Junction again again, and via Barnes to) Richmond

(via Kew Gardens to) Hammersmith

South Kensington (Picc)

Embankment

Charing Cross (walk)

(via Waterloo East and Hither Green to) Grove Park

Hither Green

Lee (run, because of cancelled train)

Mottingham
A slow start while I worked out where everything was. I knew the best route would be to do Barnes and Kew Gardens first, but couldn't be bothered to fight the rugby crowd, so looked for the first train going anywhere else helpful and plumped for one to Streatham Common. No good connection back to Streatham so decided to walk.
Up to E&C, then down to Balham, having nearly decided to double back at Clapham South to then db to Wandsworth Road. Fortunately I didn't because I would have missed Balham (LU) entirely. Off to CLJ for the second time, then the slooooooooooooow LO ride to Canada Water. Why are LO trains so unbelievably slow?
Back along the Jubilee to Waterloo, then not a long wait for a stopping train through CLJ(3) to Barnes and Richmond. I just missed a District line train at Richmond so had to wait 9 minutes for the next one but it didn't really matter. When I got to Hammersmith, a Picc was in the opposite platform so decided to try it out and see how the route to South Ken was. Not sure if I gained a train, but good experience for the future. And so along to Embankment.
Plenty of time for my planned connection out of Charing Cross, so wandered up there. Got a fast train stopping at Waterloo East, Hither Green and Grove Park - it's like a train chartered specifically for this challenge. At Hither Green I saw GU and the Raven sneaking off towards the Lee platform, then at Grove Park I met up with the RailRiders (who had already finished) and they joined me on the ride back to Hither Green.
And then the fun with the cancelled trains happened - see earlier post. Saw Edgemaster at Lee, and he saved me from another cancelled train and we headed off to Mottingham. The cancelled trains cost me 20 minutes, so I'd still have been last, just less last.
Here's a thing: after getting on the LO out of CLJ, I had everything planned to the finish. I didn't once check the map after that and it all went exactly as planned until the very last train.