Based on the true story of Melbourne Johns, an aircraft factory foreman sent to France to prevent the Nazis getting hold of some vital equipment.
| Directing | Charles Frend | Director |
| Writing | J. B. Priestley | Story |
| Camera | Wilkie Cooper | Director of Photography |
| Sound | Ernest Irving | Music Director |
| Writing | John Dighton | Screenplay |
| Editing | Robert Hamer | Editor |
| Writing | Leslie Arliss | Screenplay |
| Art | Thomas N. Morahan | Art Direction |
| Writing | Angus MacPhail | Screenplay |
| Production | Michael Balcon | Producer |
| Crew | Len Page | Sound Recordist |
| Production | Alberto Cavalcanti | Associate Producer |
| Camera | Eddie Orton | Still Photographer |
| Directing | Daphne Heathcote | Continuity |
| Directing | Ronald Brantford | Assistant Director |
| Camera | Cecil Cooney | Camera Operator |
| Production | John Croydon | Production Manager |
| Sound | William Walton | Original Music Composer |
