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Carol Marsh as Susan Graham |
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David Tomlinson as Nick Martin |
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Mervyn Johns as Ernest Bennett |
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Richard Hearne as Professor Pastry |
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Terry-Thomas as Self |
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Jimmy Edwards as Dr. Edwards |
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Peter Hammond as Spencer Stone |
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Jon Pertwee as Headwaiter |
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Wilfrid Hyde-White as Dr. B. Jekyll |
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Peter Haddon as Major Basil Beagle |
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Geoffrey Sumner as Humphrey Beagle |
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Zena Marshall as Giselle |
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Colin Gordon as Chadbeater Longwick |
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Judith Furse as Mrs. Martin |
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Edmund Willard as Ezekial |
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Robert Lamouret as The 'Duck' Man |
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Henry Kendall as Lord Bruce Carlton |
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Bill Fraser as Oliver Cromwell |
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Shirl Conway as Cabaret Star |
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George Benson as Temporary Waiter |
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Sandra Dorne as Receptionist |
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Patricia Raine as Amber |
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Ronald Adam as Director General of the BBC (uncredited) |
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Michael Balfour as Barman (uncredited) |
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Johnny Briggs as BBC Page Boy (uncredited) |
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Esma Cannon as Autograph Huntress (uncredited) |
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Cyril Chamberlain as (uncredited) |
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Andrew Crawford as First BBC Announcer (uncredited) |
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Valentine Dyall as Man Telling Story at BBC (uncredited) |
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Danny Green as Liftman (uncredited) |
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Kenneth Griffith as Nick Martin's BBC Colleague (uncredited) |
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Anne Gunning as Young Woman (uncredited) |
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James Hayter as Inn Landlord (uncredited) |
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Glynis Johns as Miranda Trewella (uncredited) |
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Michael Medwin as Man Giving BBC Boxing Talk (uncredited) |
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Hal Osmond as Radio Sound-Effects Man (uncredited) |
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Brian Oulton as BBC Producer (uncredited) |
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Wally Patch as BBC Commissionaire (uncredited) |
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Dennis Price as Lord Byron (archive footage) (uncredited) |
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Basil Radford as Maj. Bright (uncredited) |
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Harry Secombe as Alf (uncredited) |
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Anthony Steel as (uncredited) |
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David Ward as Ghost (uncredited) |
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Michael Ward as News Reader (uncredited) |
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Richard Wattis as Compere of Nick Nack Show (uncredited) |
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Naunton Wayne as Capt. Early (uncredited) |
| Directing | Ralph Thomas | Director |
| Camera | Bernard Lewis | Camera Operator |
| Directing | Edward Joseph | Assistant Director |
| Art | George Provis | Production Design |
| Writing | Patrick Campbell | Writer |
| Sound | Bill Salter | Sound Recordist |
| Costume & Make-Up | W.T. Partleton | Makeup Artist |
| Production | Antony Darnborough | Producer |
| Art | John Elphick | Production Design |
| Sound | B. C. Sewell | Sound Director |
| Sound | Muir Mathieson | Music Director |
| Sound | Francis Chagrin | Original Music Composer |
| Costume & Make-Up | Joan Ellacott | Costume Design |
| Production | William N. Boyle | Production Manager |
| Crew | Arthur Alcott | Production Controller |
| Sound | Sydney Wiles | Sound Recordist |
| Editing | Bob Wilson | Editor |
| Production | Alfred Roome | Associate Producer |
| Camera | Jack Asher | Director of Photography |
