| Person | Type | Job | Role(s) |
|---|---|---|---|
 Angus MacPhail | Crew | Writing | Writer |
 Charles Saunders | Crew | Editing | Editor |
 Edgar Wallace | Crew | Writing | Novel |
Ernest Irving | Crew | Sound | Music |
 Michael Balcon | Crew | Production | Producer |
 Roland Pertwee | Crew | Writing | Writer |
 Ronald Neame | Crew | Camera | Director of Photography |
S.C. Balcon | Crew | Production | Associate Producer |
Sergei Nolbandov | Crew | Writing | Writer |
 Walter Forde | Crew | Directing | Director |
Wilfred Shingleton | Crew | Art | Art Direction |
 Adolf Hitler | Cast | Actor | Self (archive footage) (uncredited) |
 Alan Napier | Cast | Actor | Sir Hamar Ryman M.P. |
 Anna Lee | Cast | Actress | Ann Lodge |
 Arthur Hambling | Cast | Actor | Constable Benham |
 Athole Stewart | Cast | Actor | Police Commissioner |
 Basil Radford | Cast | Actor | (uncredited) |
 Basil Sydney | Cast | Actor | Frank Snell |
 Bryan Herbert | Cast | Taxi driver (uncredited) | |
 Charles Paton | Cast | Actor | Platform Speaker (uncredited) |
 Edward Chapman | Cast | Actor | B.J. Burrell |
 Edward Rigby | Cast | Actor | (uncredited) |
 Eliot Makeham | Cast | Actor | Simmons |
Ellaline Terriss | Cast | Actress | Lady Willoughby |
 Francis L. Sullivan | Cast | Actor | Leon Poiccard |
 Frank Lawton | Cast | Actor | James Terry |
 Frederick Piper | Cast | Actor | Pickpocket (uncredited) |
 Garry Marsh | Cast | Actor | Bill Grant |
 George Merritt | Cast | Actor | Inspector Falmouth |
 Griffith Jones | Cast | Actor | James Brodie |
 Henrietta Watson | Cast | Mrs. Truscott | |
 Hugh Sinclair | Cast | Actor | Humphrey Mansfield |
James Knight | Cast | Actor | Policeman Outside Parliament (uncredited) |
 Jon Pertwee | Cast | Actor | Rally campaigner (uncredited) |
Liam Gaffney | Cast | Actor | Taxi driver (uncredited) |
 Lydia Sherwood | Cast | Actress | Myra Hastings |
 Manning Whiley | Cast | Actor | (uncredited) |
Neal Arden | Cast | Actor | (uncredited) |
Paul Sheridan | Cast | Actor | (uncredited) |
Percy Parsons | Cast | Actor | American Broadcaster (uncredited) |
Percy Walsh | Cast | Actor | Prison Governor (uncredited) |
Roland Pertwee | Cast | Actor | Mr Hastings |
 Winston Churchill | Cast | Actor | Self (archive footage) (uncredited) |
| Person | Type | Job | Role(s) |
