 Hugh SinclairHumphrey Mansfield | Humphrey Mansfield |
 Griffith JonesJames Brodie | James Brodie |
 Francis L. SullivanLeon Poiccard | Leon Poiccard |
 Frank LawtonJames Terry | James Terry |
 Anna LeeAnn Lodge | Ann Lodge |
 Alan NapierSir Hamar Ryman M.P. | Sir Hamar Ryman M.P. |
 Basil SydneyFrank Snell | Frank Snell |
 Lydia SherwoodMyra Hastings | Myra Hastings |
 Edward ChapmanB.J. Burrell | B.J. Burrell |
 Athole StewartPolice Commissioner | Police Commissioner |
 George MerrittInspector Falmouth | Inspector Falmouth |
 Garry MarshBill Grant | Bill Grant |
 Ellaline TerrissLady Willoughby | Lady Willoughby |
 Roland PertweeMr Hastings | Mr Hastings |
 Eliot MakehamSimmons | Simmons |
 Frederick PiperPickpocket (uncredited) | Pickpocket (uncredited) |
 Henrietta WatsonMrs. Truscott | Mrs. Truscott |
 Jon PertweeRally campaigner (uncredited) | Rally campaigner (uncredited) |
 Liam GaffneyTaxi driver (uncredited) | Taxi driver (uncredited) |
 Manning Whiley(uncredited) | (uncredited) |
| NNeal Arden(uncredited) | (uncredited) |
 Basil Radford(uncredited) | (uncredited) |
 Edward Rigby(uncredited) | (uncredited) |
| PPaul Sheridan(uncredited) | (uncredited) |
 Winston ChurchillSelf (archive footage) (uncredited) | Self (archive footage) (uncredited) |
 Arthur HamblingConstable Benham | Constable Benham |
 Bryan HerbertTaxi driver (uncredited) | Taxi driver (uncredited) |
 Adolf HitlerSelf (archive footage) (uncredited) | Self (archive footage) (uncredited) |
| JJames KnightPoliceman Outside Parliament (uncredited) | Policeman Outside Parliament (uncredited) |
 Percy ParsonsAmerican Broadcaster (uncredited) | American Broadcaster (uncredited) |
