OK...
Firstly, actor Gordon Jackson did not appear in the film, despite what Wikipedia says. He has no acting credit in the film in the British Film Institute database.
The crew in the movie:
Pilot: "S/L Dixon"
Percy Charles Pickard, of course
2nd Pilot: "P/O Willett"
Reputedly, P/O James Gordon Woollatt 82710 RAF, subject to confirmation. Woollatt served in 149 Sqn as a 2nd pilot, then pilot, and finished his tour shortly before filming began. I haven't confirmed this through a photographic match.
Observer: "Sgt MacPherson"
Unknown. The airman is a Scottish Sergeant Observer.
A post above says the "bomb aimer" was Ronald Burton, but that is originally based off a Facebook post. I can't find a Sgt Burton in the 149 Squadron ORB at the time of filming.
Another post above says the "navigator" was Flight Lieutenant J. A. "Bill" Broadley. Broadley was Pickard's regular navigator since 1940 but doesn't look like the "Sgt. MacPherson" in the film.
The early war RAF Observer aircrew trade was both navigator AND bomb aimer.
W/Op: "Sgt Lee"
Unknown. It was NOT "Harry Humphries".
Canadian friends and Wireless Operator/Air Gunners R58225 Sgt. John Balfour Gray RCAF and R54094 Sgt. Henry 'Harry' Frederick Charles Humphries RCAF both appeared as background extras in the movie, but not in the F-Freddy crew. Both had only just arrived in the UK and were not with operational units. Gray's letters home detailed their participation in filming.
Front Gunner: "Sgt Bell"
900012 Sgt. Joseph Ronald Bird RAF
He was posted missing on the night of 27/28 July 1942, after 218 Squadron Stirling R9160 ditched in the North Sea. Photographic evidence clearly matches Bird to the actor in the movie. He could also be the "Sgt. Bird" who served as an air gunner in 149 Squadron at the time of filming.
Rear Gunner: "Sgt Harrison"
[IGNORE]
NZ401805 Sgt. Haydn Neil Guymer RNZAF
Guymer "starring" in the film is according to a December 1941 New Zealand newspaper.
Haydn and his elder brother Leslie served as air gunners in 149 Squadron at the time of filming. Guymer has a vague resemblance to Gordon Jackson (hence the confusion), but he played a New Zealander in the movie with a clear kiwi accent (something Scotsman Jackson couldn't pull off). Haydn Guymer became a PoW on the night of 25/26 July 1941, after 15 Squadron Stirling N6029 ditched in the North Sea. His brother NZ401225 Sgt. Leslie Raymond Guymer RNZAF, was injured in the crash of 149 Squadron Wellington R1229 on the night 31 March-1 April 1941. [IGNORE]
Correction: The 1941 NZ newspaper article was misleading. The correct identity of the NZ air gunner is:
NZ391353 Sgt. Jack Desmond Harris RNZAF
Photographic confirmation:
https://fotoweb.airforcemuseum.co.nz.../?q=MUS1001612
Air Gunner Sgt Harris was commissioned in October 1941 and was awarded the DFC in September 1944. Survived the war
PS - don't trust AI answers because they throw up the most inane crap with numerous hallucinations...