| Person | Type | Job | Role(s) |
|---|---|---|---|
 Alan Osbiston | Crew | Editing | Editor |
Elliot Scott | Crew | Art | Art Direction |
 Guy Hamilton | Crew | Directing | Director, Writer |
 Irene Howard | Crew | Production | Casting |
Ivan Foxwell | Crew | Writing | Writer, Producer |
John Wilcox | Crew | Camera | Director of Photography |
Paul Winterton | Crew | Writing | Novel |
Philip Green | Crew | Sound | Original Music Composer |
Roger MacDougall | Crew | Writing | Screenplay |
Reg Bream | Crew | Art | Draughtsman |
Charles Blair | Crew | Directing | Second Assistant Director |
Noreen Hipwell | Crew | Production | Production Secretary |
Alexander Archdale | Cast | Actor | Local Doctor (uncredited) |
Andre Mikhelson | Cast | Actor | 2nd Russian Officer (uncredited) |
 Barbara Hicks | Cast | Actress | Miss Price (uncredited) |
 Basil Dignam | Cast | Actor | Lt. Cmdr. Evans at P.R.O. (uncredited) |
 Charles Carson | Cast | Actor | Robert Holland |
 Desmond Roberts | Cast | Actor | Club Member |
Dickie Owen | Cast | Actor | 2nd Policeman (uncredited) |
 Donald Bisset | Cast | Actor | Club Member |
 Duncan Lamont | Cast | Actor | 1st Special Branch man Gregson |
 Ernest Clark | Cast | Actor | Cmdr. Bates |
 Frederick Piper | Cast | Actor | Hall Porter (uncredited) |
 George Sanders | Cast | Actor | Sir Charles Holland |
Gerald Case | Cast | Actor | Club Member |
 Gordon Harris | Cast | Actor | 2nd Special Branch Man Jones (uncredited) |
 Harry Andrews | Cast | Actor | Capt. Graham |
Henry B. Longhurst | Cast | Actor | Club Member (as Henry Longhurst) |
 James Mason | Cast | Actor | Cmdr. Max Easton |
 John Horsley | Cast | Actor | 1st Editor (uncredited) |
 John Le Mesurier | Cast | Actor | Head of the Admiralty (uncredited) |
 Junia Crawford | Cast | Susan | |
 MacDonald Parke | Cast | Actor | Jason Parrish (as Macdonald Parke) |
 Martin Stephens | Cast | Actor | John Holland |
 Mavis Villiers | Cast | Actress | Adele Parrish |
 Oliver Johnston | Cast | Actor | Minister |
 Peter Barkworth | Cast | Actor | Sub Lt. Brown |
 Rachel Gurney | Cast | Actress | Clara Holland |
Reginald Smith | Cast | Club Steward | |
 Richard Marner | Cast | Actor | Russian Officer Cornered by Max Easton (uncredited) |
 Robert Flemyng | Cast | Actor | Cmdr. John Larkin |
Roger Maxwell | Cast | Actor | Club Member |
 Ronald Leigh-Hunt | Cast | Actor | 2nd Editor (uncredited) |
 Vera Miles | Cast | Actress | Virginia Killain |
William Kendall | Cast | Actor | Tom |
 William Mervyn | Cast | Actor | Capt. Balfour (uncredited) |
Waveney Lee | Cast | Actress | Marcia Holland |
Pat Ryan | Cast | Nightclub Patron (uncredited) | |
Rosemary Dorken | Cast | WREN Officer | |
Mabel Etherington | Cast | Actress | Nightclub Patron (uncredited) |
John More | Cast | American General at Embassy Party (uncredited) | |
Frederick Kelsey | Cast | Club Member (uncredited) | |
Stanley Zevic | Cast | 1st Russian Officer (uncredited) | |
| Person | Type | Job | Role(s) |
