London to Paris: Route Advice

Anyone got advice on routes for the London to Paris?

im thinking of doing it in the next couple of weeks (october 2010) aiming for 1 massive push, so between 24-48 hours... anyone interested?
I did L2P earlier in the summer with the target of 24 hours. We took a fairly direct route from Calais, which was pretty hilly. We didn't make the target time as one of the team was feeling pretty rough so we eased right off the pace. See this thread.
I could be convinced to do it again.