I live about 3 miles from it and can assure you its not usable! As others have said, there's a market on weekends and I think I've seen drag-racing etc. up there too.
It was used by Bomber Command during the war and I am told by local friends who have lived here a long time that they used to fly Shackletons from there I think as late as the '70s. I don't think Mosquito's were based there (could be wrong?) but I have read that the movies "The War Lover" (1961), "633 Squadron" and "Mosquito Squadron"(1964) were produced there.
Oh, and part of it is now a prison!
Andy