The movie takes place during WWII. A dashing British RAF Officer is earmarked for a secret mission behind enemy lines in occupied France, but wishing to distract the enemy, enlists a person to double for him and thereby draw attention to North Africa . An unlikely airman is found and tutored in the ways of an English officer.

When newly weds Jack and Peggy face eviction, they are tricked into buying a run down houseboat. After rebuilding the engine, they take their friends Sid and Sandra, on a local trip down the river to Folkestone, but somehow they end up in France, and with no fuel and supplies, they resort to desperate actions to get back home.

Norman is a window cleaner who has to clean a manor house with hundreds of windows. He is distracted by the son of the house who persuades him to go into town. When some villains try and kidnap the young heir Norman fights them off but the heir has banged his head and can't remember Norman's heroic stand

Norman works in a jewellers workshop and fantasises (in the nicest way) about meeting the window dresser across the road from his workshop. He wants to buy her a diamond pendant but calculates it will take him over 100 years to save up for it. He is talked into betting a pound on a six horse accumulator at the Goodwood races with a slightly shady bookmaker. When he has won on the first five races, the bookie owes him over 16,000 pounds and everyone begins to worry. Everyone's future depends on a single race ... what can be done ?

Good natured comic caper charting the misadventures of a hapless bunch of Brighton based petty crooks dogged with disaster at every turn.