I did it earlier this year and had booked a cpl of months in advance to give myself something to aim for. The day rolled around and it was lashing it down with rain all morning. I rode to Dorking, signed in, rolled away with the first group, got a p*ncture after 10 mins, took a wrong turn, got lost, found myself on the A24 up by Boxhill when should have been heading south, took an improvised short cut to meet up with the route again, slogged along some lanes that were like rivers and inevitibly the rain stopped and the sun came out as soon as I got back to the HQ

The route was ok though and would have been even better if I hadn't been such a numpty by missing the turn and if it had been nice weather!