The Runaway Bus

The Runaway Bus is a 1954 British comedy film produced, written, and directed by Val Guest. It stars Frankie Howerd, Margaret Rutherford and Petula Clark. It was made at Southall Studios in London.

Two of the crooks are caught under questioning by Inspector Henley John Horsley, one breaks down and admits the gold was stowed on the coach and that the mysterious and notorious Banker is the mastermind. Henley informs Percy by radio, but the fog is so thick, Percy has no idea where he is. In midcall, Peter pokes what Percy thinks is a gun into Percys back and tells him to keep driving. They wind up at a deserted boobytrapped village used by the Army for training.When Schroeder finds a Sten gun, Peter grabs it. Schroeder then informs him that it does not work, and produces a pistol of his own. After a scuffle, it turns out that Peter is working for airport security, while Schroeder is a policeman. Miss Beeston the Banker ends up with the gun, and her henchman Henry tries to start the coach. Percy saves the day, having removed the rotor from the engine, and knocking the pistol out of Miss Beestons hand with a stone. ........

Source: Wikipedia