Interesting, but Manston seems a slightly odd choice (apart from, perhaps, financially), as the current airfield, and the surroundings, bear little resemblance today to a WW2 airfield. I'm not totally up-to date on the state of recently closed RAF airfields, but some of them which have not already become civil fields, will still be on 'Care and Maintenance', meaning the infrastructure is still in place and, with movie 'magic' could be transformed into a WW2 airfield relatively easily, as Binbrook was for 'Memphis Belle'.
I look forward to seeing how things turn out.