From memory, all the BoB aircraft acquired by Spitfire Productions gathered at Bovingdon, though I don't think much if any filming took place there.
If I haven't mentioned it before, "Everything but the Flack" is Martin Caidin's book about the acquisition and delivery of the War Lover B-17s - worth getting a copy if you can!
Bernard Martin - is he still around? Used to enjoy his chatty round up of UK registration happenings in Air Britain...