Watch it, Sailor! is a 1961 British 'Hammer Film Productions' comedy film. It features Marjorie Rhodes, Cyril Smith, Vera Day, Liz Fraser, John Meillon, Dennis Price, and Frankie Howerd.
Sailor Albert gets a message from the Navy saying he can't marry for certain unexplained legal reasons. Everyone, including his domineering mother-in-law to be, jumps to the conclusion that there must be another woman involved.