you should try maidenhead man, it seems a small place but i can think of a few spots, google map, SL61AA and put the little street view man on the stafferton road

there sn old abbandond Ford garage, been there for yearrrrs, used to have a skatepark in there we built etc. loadsa good graffiti as well in there, think you might have to jump a fence, but check it out on streetview