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