High Treason (1951) — Cast
Cast
| John Boxer | (uncredited) |
| Philip Dale | Waitress in Cafe |
| Hyma Beckley | Music |
| Peter Jones | Music |
| Julian Somers | (uncredited) |
| John Warwick | (uncredited) |
| Richard Shaw | Waitress in Cafe |
| Lockwood West | (uncredited) |
| Marianne Stone | (uncredited) |
| Andrew Donally | (uncredited) |
| George Hilsdon | (uncredited) |
| Stephen Jack | (uncredited) |
| Tony Quinn | Lecturer |
| Dandy Nichols | Porch |
| Richard Massingham | Music |
| Bill Rayment | Station |
| Alfie Bass | Brewer |
| Mary Morris | Anna |
| Basil Cunard | Superintendant |
| Frank Ling | Engineer |
| John Warren | (uncredited) |
| Howard Lang | Policeman |
| Harry Locke | Engineer |
| Ian Wilson | Glass |
| Michael Ward | Music |
| Moultrie Kelsall | (uncredited) |
| Stuart Lindsell | Acting Commissioner |
| Cyril Conway | (uncredited) |
| Dora Bryan | Hike Bowers |
| Julien Mitchell | Philips |
| Victor Harrington | (uncredited) |
| Charles Rolfe | Policeman |
| Reg Thomason | (uncredited) |
| Joe Wadham | Station |
| John Harvey | Scotland |
| Kenneth Griffith | Jimmy |
| Jack McNaughton | Scotland |
| Victor Maddern | (uncredited) |
| Charles Lloyd Pack | Ward Patient |
| Liam Redmond | Brennan |
| André Morell | Supt. Newhouse |
| Sam Kydd | Printer |
| Hélène Burls | Skinner |
| Joan Hickson | Ellis DeWald |
| Patric Doonan | George |
| John Bailey | L.A. Stringer |
| Julian Amyes | Evan Slater |
| Everley Gregg | Finch |
| Laurence Naismith | Reginald |
| Anthony Bushell | Elliott |
| Anthony Nicholls | Mansfield |
| Geoffrey Keen | Byron Williams |
| Glyn Houston | (uncredited) |
| Pauline Winter | Music |
| Douglas Ives | (uncredited) |
| Bruce Seton | (uncredited) |
| Harry Fowler | (uncredited) |
| Howard Lang | Body |
| Jean Anderson | (uncredited) |
| Barry Johns | (uncredited) |
Crew
| Gilbert Taylor | Director of Photography |
| Ray Sturgess | Camera Operator |
| Alex Vetchinsky | Set Decoration |
| W.T. Partleton | Makeup Artist |
| Frank Harvey | Screenplay |
| Roy Boulting | Screenplay |
| Biddy Chrystal | Hairstylist |
| Paul Soskin | Producer |
| Roy Boulting | Director |
| John Addison | Music |
| Max Benedict | Editor |