the 109's in the film did have the merlin engine, alot of work went into making them "look more like 109's" for example... adding machine guns and cannons, sorting the wing tips out.
Alot of work went inot the film in trying to get so many aircraft together for filming.
I have te book on the making of the film, and one part goes on about when they arrived at duxford. Some old war vet was standing their looking at all theses swastikas on the field and hen said....
"well,its a strange sight isnt it? considering the fact that we won the war, i never thought id see a squadron of those buggers sitting on our airfields"
it made me chuckle
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