It’s easy to imagine the head of today’s Royal Navy wishing they could see what’s presented at the beginning—a naval force noticeably bigger than Britain's present one! A politician known as "Tom" (David Tomlinson) is doing a preliminary assessment for his superior when he runs into an old friend, ship’s captain "Peter" (Brian Reece). Because of a mistake by a housemaid called "Mary" (Joan Sims), they begin exchangin…