I haven't seen "Reach for the Sky" on film but i first read the book nearly 50 years ago.
This may be old news but this Canadiancompany offers copies of old British
War movies (including "RFTS") that are all but unobtainable in the US or via netflix.
Learmedia Rare and Classic Videos
I purchased a copy of "A Sailor of the King" (based on C.S. Forster's "Brown on Resolution) from them a few years ago. There was a minor shipping snafu that they quickly rectified overall good people to deal with.
The story of Bader's prewar injuries, rehabilitation and return to flight status are amazing in themselves. Equally astounding is his escape from the aircraft after being shot up over Franceand his role as an escaper. he gave the Germans fits!
Regards,
Jim