| Person | Type | Job | Role(s) |
|---|---|---|---|
 Frank Harvey | Crew | Writing | Screenplay |
 John Boulting | Crew | Directing | Director, Producer, Screenplay |
Mutz Greenbaum | Crew | Camera | Director of Photography |
Richard Rodney Bennett | Crew | Sound | Original Music Composer |
 Roy Boulting | Crew | Directing | Director, Producer |
Teddy Darvas | Crew | Editing | Editor |
Laurie Ridley | Crew | Camera | Still Photographer |
Malcolm Muggeridge | Crew | Writing | Idea |
 Anna Wing | Cast | Actress | Housewife (uncredited) |
 Basil Dignam | Cast | Actor | Prison Governor |
 Bernard Miles | Cast | Actor | Simpson |
 Brock Peters | Cast | Actor | Matthew Robinson |
 Cardew Robinson | Cast | Actor | Tramp |
 Cecil Parker | Cast | Actor | Archdeacon Aspinall |
 Colin Gordon | Cast | Actor | Prime Minister |
 Conrad Phillips | Cast | Actor | Deaf Man |
 Derek Nimmo | Cast | Actor | DG Assistant |
 Eric Barker | Cast | Actor | Bank Manager |
 Eric Sykes | Cast | Actor | Harry Smith |
 Gerald Sim | Cast | Actor | Store Manager |
 Harry Locke | Cast | Actor | Shop Steward |
 Ian Carmichael | Cast | Actor | The Other Smallwood |
 Irene Handl | Cast | Actress | Rene Smith |
 Isabel Jeans | Cast | Actress | Lady Despard |
 Joan Hickson | Cast | Actress | Housewife |
 Joan Miller | Cast | Actress | Mrs Smith-Gould |
 John Comer | Cast | Actor | Butcher |
 John Junkin | Cast | Actor | Reporter at Space Launch Site (uncredited) |
 Louis Mansi | Cast | Actor | Man Buying Groceries (uncredited) |
 Kenneth Griffith | Cast | Actor | Rev. Owen Thomas |
Ludovic Kennedy | Cast | Himself | |
 Marianne Stone | Cast | Actress | Miss Palmer |
 Mark Eden | Cast | Actor | Sir Geoffrey Despard |
 Miles Malleson | Cast | Actor | Bishop Rockeby |
 Miriam Karlin | Cast | Actress | Winnie Smith |
 Nicholas Phipps | Cast | Actor | DG |
 Peter Sellers | Cast | Actor | The Rev. John Smallwood |
 Rodney Bewes | Cast | Actor | Milkfloat Driver (uncredited) |
 Roy Kinnear | Cast | Actor | Fred Smith |
Steve Marriott | Cast | Jack (uncredited) | |
 Thorley Walters | Cast | Actor | Tranquilax Executive |
 William Hartnell | Cast | Actor | Major Fowler |
Geoffrey Hibbert | Cast | Actor | Council Official |
Malcolm Muggeridge | Cast | Actor | Cleric |
 John Harvey | Cast | Actor | Wilson, Prison Officer |
| Person | Type | Job | Role(s) |
