 | Robert Newton Dr. Clive Riordan |
 | Phil Brown Bill Kronin |
 | Sally Gray Storm Riordan |
 | Naunton Wayne Supt. Finsbury |
 | James Harcourt Aitkin (butler) |
 | Betty Cooper Miss Stevens (receptionist) |
 | Allan Jeayes The Colonel, blustery club member |
 | Ronald Adam Talkative, balding club member |
 | Roddy Hughes Bespectacled third club member, from Whitehall |
 | Olga Lindo Mrs. Humphries |
 | Stanley Baker Policeman at Garage |
 | Russell Waters Detective at Garage |
| Michael Balfour American Sailor Promoting Book |
 | Sam Kydd Club steward |
 | Ernest Clark |
| Lyonel Watts Club Member |
| Sound | |
| Nino Rota | Original Music Composer |
Directing | |
| Edward Dmytryk | Director |
Writing | |
| Alec Coppel | Novel |
Editing | |
| Lito Carruthers | Editor |
Production | |
| Nat A. Bronstein | Producer |
Writing | |
| Alec Coppel | Screenplay |
Camera | |
| C.M. Pennington-Richards | Director of Photography |
Costume & Make-Up | |
| Betty Baugh | Hairstylist |
Art | |
| Duncan Sutherland | Art Direction |
Costume & Make-Up | |
| Stuart Freeborn | Makeup Artist |
Directing | |
| George Mills | Assistant Director |
Production | |
| Kenneth Horne | Production Manager |
Sound | |
| Louis Levy | Conductor |
Writing | |
| Alec Coppel | Dialogue |
Art | |
| Ken Adam | Assistant Art Director |
Sound | |
| Winston Ryder | Sound Editor |
Crew | |
| Phil Brown | Dialogue Coach |
Production | |
| Kenneth Horne | Associate Producer |
Sound | |
| Gordon K. McCallum | Sound Recordist |
Camera | |
| Robert Day | Camera Operator |
Directing | |
| Barbara Cole | Continuity |
Sound | |
| Jack Locke | Sound Recordist |
