I saw this black & white movie trailer decades ago: a British film, I think? It starts with a rooftop view of a man running down a street dressed in a black graduation cap & gown. The image freeze-frames on him while a V/O says, “See this man? Good show! Carry on!” Then this same guy is in a classroom where he’s teaching a room full of college-age girls. He asks them a question, to which they answer, and he replies, “Yes!”. Then later in the trailer, one of the girls spells out (I think) this teacher’s name as it appears on the screen, which I think, is also the name of the movie? I’ve searched for DECADES looking for this movie trailer without success. Can YOU help?
Could be one of the (many) Carry On Films:
Carry On Teacher
Or you can look at this list: