Pool of London

Moira Lister

Maisie

Max Adrian

Charlie Vernon - acrobat / George

Joan Dowling

Pamela, Maisie's sister

James Robertson Justice

Engine Room Officer Trotter

Leslie Phillips

Harry

Alfie Bass

Alf

John Longden

DI Williams

Michael Golden

Customs Officer Andrews

Christopher Hewett

Mike

John Adams

Plainclothes Policeman in Squad Car (uncredited)

John Arnatt

Squad Car Officer (uncredited)

Mae Bacon

Ethel the Barmaid (uncredited)

Ian Bannen

Garage attendant (uncredited)

George Benson

George (uncredited)

Arthur Bentley

Pamela's Boyfriend (uncredited)

Beckett Bould

The Murdered Watchman (uncredited)