Beagle yes that's the movie! The chap who play the character who was so miffed initially at the newbie for getting in his way was a Battle of Britian Hurricane vet in real life!
The badly burned sector controller who so frightened Susanah Yorke in BoB was also a real life vet of that 'tumult in the clouds' who was one of the early plastic surgery guinea pigs.
As a teenager in Sydney Paul Brickhill was a neighbour and another chap who ran a local camera and remote control model aeroplane shop was a BoB vet. Spent hours listening to them. His shop was called Red Baron something or other from his squadron nickname. While a bona fide ace himself he had also been shot down more often than he shot others from the sky, hence his sqadron mates were never quite sure who's side he was on.
Chuck.