An AI search turned up:
The primary crew members who flew the Wellington bomber in the film (call sign "F for Freddie") were:
Pilot / Captain (Squadron Leader Dickson): Played by Squadron Leader (later Group Captain) Percy Charles "Pick" Pickard.
Second Pilot / Co-pilot: Played by Pilot Officer (later Flight Lieutenant) Gordon Woollatt.
Front Gunner: Played by Flight-Sergeant Joseph Ronald Bird.
No idea how accurate this is.
The film is on youtube:
https://www.youtube.com/watch?v=9L8tXDt6Wr4