A brave wartime copper (policeman) becomes a hero when he thwarts a plot to destroy a battleship. But then the rest of the police get the idea that he is one of the enemy agents.

George has won a lot of money at the races but he's paid with counterfeit money. He sets about tracking down the criminals himself.

George Shuttleworth is convinced that he has the talent to win the Isle of Man TT races, despite what his neighbours back home in Wigan may think. During the trials, the brakes go on George's bike, 'The Shuttleworth Snap', which he made himself. As a result, he breaks the TT lap record, becoming an instant motor-cycling star. As the big race approaches, George soon realises that other jealous riders will stop at nothing to make sure he does not take part in the race. An early George Formby film and probably his best.

Nazi spies are out to destroy a new submarine killer, the "Firefly", being developed by the British navy. A hapless waiter named George, after being rejected for military service three times, finally "joins" when, during an air raid, he is mistaken for a real sailor. He soon unwittingly stumbles into the secret hideout of the Nazi spies trying to destroy the Firefly. Complications ensue.