Well, after hearing about this ride last year, I decided on doing it this year, since I didn't have a good enough excuse not to. It's a 200km semi-organised ride (turn up and go, if you want, pay up-front for a ride home if you need one) from London to the Dunwich, on the Suffolk Coast.

I didn't really intend to get much mapping done because

a) It's a very long ride
b) It's a night-time ride. Leave at 9pm, ride through the setting sun, watch it rise again, and arrive at the beach in the morning.

It's difficult to map under such circumstances. However, I did get a pretty full GPS trace of the ride, which has been uploaded, and I've marked off the few stopping points that I remembered.