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Terry-Thomas as Lord Henry Mayley |
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Peter Sellers as "Wee" Sonny MacGregor |
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Peggy Mount as Flora Ransom |
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Shirley Eaton as Melissa Right |
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Dennis Price as Nigel Dennis |
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Georgina Cookson as Lady Lucy Mayley |
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Joan Sims as Ethel Ransom |
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Miles Malleson as Reverend Cedric "Daddy Bassy" Bastable |
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Kenneth Griffith as Porter |
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Bill Edwards as Bill Murphy |
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Wally Patch as Fred |
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Henry Hewitt as Gunsmith |
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John Stuart as Police Inspector |
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David Lodge as PC Johnson |
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Joan Hurley as Désirée Mensch aka D. Mandeville |
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Peter Noble as TV announcer |
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Victor Rietti as Dr Harz |
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Ronald Adam as Chemist (uncredited) |
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George Benson as Photographer (uncredited) |
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Tom Gill as Police Officer (uncredited) |
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Muriel Greenslade as Dinner Guest (uncredited) |
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Andy Ho as Chinese Man in Pub (uncredited) |
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Barry Keegan as 2nd Irishman (uncredited) |
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Kenneth Kove as Man Who Lets Out Police Car's Tyre (uncredited) |
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Wilfrid Lawson as Walter - Contestant in T.V. Show (uncredited) |
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Arnold Marlé as Scientist (uncredited) |
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Edie Martin as Lady in Autograph Crowd (uncredited) |
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Gibb McLaughlin as Old Man in T.V. Show Audience (uncredited) |
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Marjorie Rhodes as Lady on Phone (uncredited) |
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Michael Ripper as J.E. Freeman - Greengrocer (uncredited) |
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Raymond Rollett as Pub Landlord (uncredited) |
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Austin Trevor as Minister with Heart Attack (uncredited) |
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Jerold Wells as 1st Irishman (uncredited) |
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Esme Smythe as Dinner Guest (uncredited) |
| Directing | Mario Zampi | Director |
| Writing | Michael Pertwee | Writer |
| Sound | Stanley Black | Music |
| Production | Giulio Zampi | Associate Producer |
| Editing | Bill Lewthwaite | Editor |
| Production | Dorothy Holloway | Casting |
| Production | Mario Zampi | Producer |
| Crew | Stanley Pavey | Cinematography |
| Art | Ivan King | Art Direction |
| Sound | Fred Ryan | Sound Recordist |
