The Wellington was cleared for para dropping and the film was realistic in that way ther than the stick cadance was far too slow. The Bruneval raid did of course use Whitleys for the drop but I suppose that by the time the film was made there would have been none of those left.
the line in the film that tickled me was the one where Canada (Allan Ladd) rejected his parachute because it was an X type only to be given another X type (the standard British Assault parachute of the time).
The serial of Hastings TG522 is visible in the film and when the Dakota that the main characters chase taxies out it has a US star on the port side and an RAF roundle on the starboard 😮
On the whole the film is forgettable tosh but I’ve seen worse.