Likeable country postman Harold Petts gets transferred from his village to London, where on his arrival he unwittingly foils a mail train robbery. Innocent in the ways of the big city, he is thought to be a member of another gang by both the train robbers and the police, who all suspect him of trying to rob the post office where he works.
| Writing | John Briley | Screenplay |
| Production | Ronald Kinnoch | Producer |
| Directing | Robert Lynn | Director |
| Sound | Ron Goodwin | Music |
| Writing | Jack Trevor Story | Story |
| Writing | Jack Trevor Story | Screenplay |
| Crew | Gerald Moss | Cinematography |
| Editing | Geoffrey Foot | Editor |
