Sidney James

Sergeant Frank Wilkins

Eric Barker

Inspector Mills

Kenneth Connor

Constable Charlie Constable

Charles Hawtrey

Special Constable Timothy Gorse

Kenneth Williams

Constable Stanley Benson

Leslie Phillips

Constable Tom Potter

Joan Sims

Policewoman Gloria Passworthy

Hattie Jacques

Sergeant Laura Moon

Shirley Eaton

Sally Barry

Cyril Chamberlain

Constable Thurston

Joan Hickson

Mrs. May

Irene Handl

Willie's Mother

Terence Longdon

Herbert Hall

Jill Adams

Policewoman Harrison

Freddie Mills

Jewel Thief

Brian Oulton

Store Manager

Victor Maddern

Detective Sergeant Liddell

Esma Cannon

Deaf Old Lady

Noel Dyson

Fluff's Owner

Tom Gill

Citizen

Frank Forsyth

Citizen

Michael Balfour

Matt

Lucy Griffiths

Miss Horton

Peter Bennett

Pickpocket

Arnold Diamond

Chief Constable (voice) (uncredited)

Colin Gordon

(uncredited)

Bruce Seton

(uncredited)

Marianne Stone

Miss Horton (voice) (uncredited)

Kenneth J. Warren

Chauffeur (uncredited)

Ian Wilson

(uncredited)