Dave,
From the 'ring, I fly into LHR around Monday lunch time.
I tend to cram as many things in as I can on trips like this, but have found myself with a spare day or two this time around. I will be in Stoke on Trent for two days, Derby for a few hours one day, and I will also be catching up with a good friend at some point (Old Windsor).
I'll more than likely stop by Silverstone for a quick visit, my friend is a member of the BRDC, and thought it'd be good to have a look around there.
Other than that, I'll probably just shop some (hard to get) parts out for the GT40 from a couple of suppliers over there. I'm working on my plan of attack as we speak!
From memory, I fly out on the 23rd (Sunday) morning.