Some Mothers... is an under-rated gem if you ask me. Warm hearted and genuinely funny. It's got corny bits, true, but at its best it delivers enormous laughs for me even today. It's hard to imagine anyone but Crawford doing it anywhere near as well.
Someone else mentioned Crawford appeared in the 60s film "The Knack and How to Get It". If you are up for very-much-of-its-time weird Britcom then this is well worth seeking out. Directed by Richard Lester in the same period he made the Beatles films.