FS:-
Does anyone have info on locations for the filming ?
I don't I'm afraid, though agree that quite a lot was from the BoB film. There is some blurb here re the original screening in 2010 for the 70th aniversary together with a chance to stream the video:-
BBC Two - First Light
I like Wellum's inclusion in the credits as "Older Boy" as distinct from "Boy" ;-)