Without wanting to give too much away, I have spent a good deal of time with my head in road maps and google earth during the last week.
There is a great deal to think about before the event even begins and deciding how much to pre-plan I guess will be determined by your budget and how much time you have to complete the challenge.
So this week I have booked hotels in London for the pre-race briefing. programmed for the evening of the 7th August in 'Look Mum No Hands' http://www.lookmumnohands.com/
I've booked ferry tickets to Dieppe, (pronounced sort of deep apparently,) paid for extreme sport insurance, purchased train tickets to London and even acquired some Euros and other far flung currencies......So Dieppe huh. Why that way and not Calais?
The location chosen because of its historical significance, being the starting point of the first Tour de France, it is now a cabaret bar by all accounts. There is at least some reference to its past outside on the roundabout.