Not doing it this year but did it a few years ago – pretty well organised event. It’s run under the British Triathlon rules so it’s a bit more strict than the events I normally do (24hr mtb/marathons). On entering the transition area for the second time I started to take my helmet off to save a couple of seconds or so, but was told in no uncertain terms that I was not to take my helmet off until I reached my area even though all i was doing was walking with the bike. Wouldn’t stop me doing the event again though.
As for drying out – it might dry out ok so long as the rain we have at the moment stops today. It’s quite quick draining up at the Pines.
Good luck and let us know how you get on.