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| Cast |
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| John Barrington | BANKS, Leslie |
| 'Charles Dimble' | SIM, Alastair |
| Flight Lieutenant George Perry | MILLS, John |
| Mrs Barrington | DE CASALIS, Jeanne |
| Helen Barrington | LEHMAN, Carla |
| Ronald Mittsby | COLE, George |
| Alan Trently | WILDING, Michael |
| Ernest Forest | CELLIER, Frank |
| Miss Fernery | AKED, Muriel |
| 'Evans'/Detective Brownrigg | PATCH, Wally |
| Sara Trimm | GEORGE, Muriel |
| Dr Truscott | PETRIE, Hay |
| Miss Stokes | LACEY, Catherine |
| RAF officer (uncredited) | TAFLER, Sydney |
| RAF general (uncredited) | GAWTHORNE, Peter |
| ministry official (uncredited) | KING, Sydney |
| Scotland Yard inspector (uncredited) | HAMBLING, Arthur |
| German agent (uncredited) | HUGHES, Roddy |
| Scot police inspector (uncredited) | O'RORKE, Brefni |
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| Credits |
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| Directed by | ASQUITH, Anthony |
| Production Company | Gainsborough Pictures |
| Presented by | Gaumont-British Picture Corporation |
| Produced by | BLACK, Edward |
| In Charge of Production | OSTRER, Maurice |
| Production Manager (uncredited) | GUNN, Fred |
| Assistant Director (uncredited) | ANDERSON, Michael |
| Continuity (uncredited) | HARCOURT, Jo |
| Screenplay by | DE GRUNWALD, A. |
| | ORTON, J.O.C. |
| Adapted from the play by | KERR, Geoffrey |
| Photography | COX, Jack |
| Camera Operator (uncredited) | KNOWLES, Cyril |
| 2nd Camera Operator (uncredited) | STEVENS, George |
| Focus Puller (uncredited) | HARCOURT, David |
| 2nd Camera Assistant (uncredited) | HILL, Duggie |
| Editing | DEARING, R.E. |
| Cutting | SAUNDERS, Charles |
| Art Direction | VETCHINSKY |
| Assistant Art Director (uncredited) | CARTER, Maurice |
| Draughtsman (uncredited) | BROADHOUSE, James |
| Make-up (uncredited) | PARTLETON, W.T. |
| Musical Director | LEVY, Louis |
| Sound Supervision | SEWELL, B.C. |
| Recording | HOBBS, M. |
| Sound Recording (uncredited) | WILES, Sid |
| Sound Camera Operator (uncredited) | JAY, Mickey |
| Studio | Shepherd's Bush Studios |
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