Hey, wasn't that Peter Lawford?
Okay, maybe this is a long shot, but is there any chance that Peter Lawford appeared in this film? It's about 55 minutes into the film, and he (or whoever the actor is) has one line: "Danny Churchill or no Danny Churchill, he's not going to change this school around to his liking!"
I checked Lawford's IMDB filmography, and this film isn't listed---however, during this time period he was doing a lot of uncredited extra work in pictures, since his career was just starting. So, anyone else think this is him?