Directed by
| Alan Bromly | ||
Writing Credits (in alphabetical order)
| William Douglas-Home | ||
| Howard Mason | ... | (novel) |
| Alfred Shaughnessy | ||
Cast (in credits order)
| David Tomlinson | ... | Dick Lanchester | |
| Cecil Parker | ... | Sir William Crane | |
| Richard Wattis | ... | Hugh Porlock | |
| Mary Peach | ... | Susan Turner | |
| Dora Bryan | ... | Miss Bradstock | |
| Raymond Huntley | ... | Special Branch Chief | |
| Sam Kydd | ... | Farrell | |
| George Pravda | ... | Hammler | |
| John Welsh | ... | Major Turner | |
| Peter Copley | ... | Garrod | |
| Cyril Shaps | ... | Dr. Spiegel | |
 |
Victor Brooks | ... | Blake |
|
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Vic Wise | ... | Riley |
| George A. Cooper | ... | Rudd | |
|
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Alison Fraser | ... | Harriet |
| Rest of cast listed alphabetically: | |||
|
|
Jonathan Clyde | ... | (uncredited) |
| Peter Collingwood | ... | (uncredited) | |
|
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John Crewdson | ... | Pilot (uncredited) |
| Guy Deghy | ... | German Delegate (uncredited) | |
| Edward Dentith | ... | (uncredited) | |
| Arthur Lowe | ... | Auctioneer (uncredited) | |
| John Phillips | ... | American Delegate (uncredited) | |
| John Serret | ... | (uncredited) | |
| Tony Thawnton | ... | Special Branch Man (uncredited) | |
Produced by
| Thomas Clyde | ... | producer |
Music by
| Stanley Black | ||
Cinematography by
| Norman Warwick | ||
Editing by
| Gerald Turney-Smith | ||
Art Direction by
| Harry White | ||
Makeup Department
| Eric Aylott | ... | makeup artist |
| Polly Young | ... | hair stylist |
Production Management
| Victor Peck | ... | production manager |
Second Unit Director or Assistant Director
| Frederic Goode | ... | assistant director |
| William P. Cartlidge | ... | third assistant director (uncredited) |
| Michael Profit | ... | second assistant director (uncredited) |
Sound Department
| Herbert J. Bird | ... | sound recordist (as Herbert Bird) |
| Terry Sharratt | ... | sound |
| Len Shilton | ... | sound recordist |
| Allan Morrison | ... | sound editor (uncredited) |
Camera and Electrical Department
| Tony White | ... | camera operator |
| Maurice Arnold | ... | focus puller (uncredited) |
Editorial Department
| Don Deacon | ... | first assistant editor (uncredited) |
Music Department
| Stanley Black | ... | conductor |
Script and Continuity Department
| June Randall | ... | continuity |
Additional Crew
| Maurice Landsberger | ... | assistant accountant (uncredited) |
