I caught the end of a movie about a searchlight crew in WW2. They were a parcel of rogues- all with rather more on their minds than biffing the Germans. Ian Carmichael was the ineffectual commanding officer, Victor Maddern the incompetent NCO and Tommy Steele, Benny Hill and Johnny Briggs (best known for a decades long stint in Coronation Street) played three of the variously insubordinate privates. It was implausibly good. I was telling Ailz about it afterwards and she said, "I know that movie, only I thought I'd imagined it."
It's called Light Up the Sky. It was directed by Lewis Gilbert in 1960. Tommy Steele waived part of his fee to be in it.