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Professor Marcus

Cecil Parker

Claude, alias 'Major Courtney'

Herbert Lom

Louis, alias 'Mr. Harvey'

Peter Sellers

Harry, alias 'Mr. Robinson'

Danny Green

'One-Round', alias 'Mr. Lawson'

Katie Johnson

Mrs. Wilberforce

Jack Warner

The Superintendent

Philip Stainton

The Sergeant

Frankie Howerd

The Barrow Boy

Madge Brindley

Large Lady (uncredited)

Hélène Burls

Hypatia (uncredited)

Kenneth Connor

Cab Driver (uncredited)

Michael Corcoran

Burglar (uncredited)

Harold Goodwin

Parcels Clerk (uncredited)

Fred Griffiths

Junk Man (uncredited)

Lucy Griffiths

Miss Pringle (uncredited)

George Hilsdon

Security Van Driver (uncredited)

Vincent Holman

Station Master (uncredited)

Stratford Johns

Security Guard (uncredited)

Sam Kydd

Second Cab Driver (uncredited)

Edie Martin

Lettice (uncredited)

Jack Melford

Detective (uncredited)

Arthur Mullard

(uncredited)

Ewan Roberts

Constable (uncredited)

George Roderick

Radio Car Policeman (uncredited)

John Rudling

Nervous Man (uncredited)

Leonard Sharp

Pavement Artist (uncredited)

Peter Williams

Detective at Parcels Office (uncredited)

Neil Wilson

Policeman (uncredited)

Phoebe Hodgson

Constance (uncredited)

William Rose

Screenplay

Otto Heller

Director of Photography

Jack Harris

Editor

Alexander Mackendrick

Director

Michael Balcon

Producer

Jimmy O'Connor

Screenplay

Sydney Pearson

Special Effects

Dock Mathieson

Music Director

Hal Mason

Production Supervisor

Tom Pevsner

Assistant Director

Bert Davey

Assistant Art Director

Jack Shampan

Set Designer

Chic Waterson

Camera Operator

Jim Clark

Assistant Editor

Jim Morahan

Art Direction

Anthony Mendleson

Costume Design

Alan Bryce

First Assistant Camera

W. Simpson Robinson

Scenic Artist

David Peers

Unit Production Manager

Alex Garfath

Makeup Artist

Tony Rimmington

Set Designer

Ray Parslow

First Assistant Camera

Herbert Smith

First Assistant Camera

Harry Aldous

Assistant Editor

Norman Dorme

Set Designer

Joan Bridge

Color Timer

Daphne Martin

Hairstylist

Stephen Dalby

Supervising Sound Editor

Felicia Manheim

Continuity

William Rose

Story

Seth Holt

Associate Producer

Leo Wilkins

Sound Recordist

Gordon Stone

Sound Editor

Robin Clarke

Assistant Editor

Tristram Cary

Original Music Composer

Ealing Studios

GB

Michael Balcon Productions