The Bulldog Breed

The Bulldog Breed is a 1960 British comedy film starring Norman Wisdom and directed by Robert Asher.

Life in the Navy proves not to be as rosy as described, and Puckle fails at every task during basic training. But despite this, he is regarded by the Admiral in charge of a rocket project to be a typical average British sailor, and chosen to be the first man to fly into outer space in an experimental rocket.Puckle fails at every stage of his training and is courtmartialled, but successfully pleads for a final chance to prove himself. By accident, he takes the place of an astronaut and leaves Earth in the rocket. Equally by accident, he manages to return. He crashlands on a Pacific island and ends up in the arms of a compliant local maiden. ........

Source: Wikipedia