Susan Shaw

Pat

Renée Asherson

Sally

Earl Cameron

Johnny Lambert

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 Arnatt

Squad Car Officer (uncredited)

Ian Bannen

Garage attendant (uncredited)

John Boxer

Detective in Pub (uncredited)

David Davies

Officer on the Dunbar (uncredited)

Fred Griffiths

Sailor on Barge (uncredited)

Sam Kydd

2nd Engineer (uncredited)

Howard Lang

Detective Detaining Suspect (uncredited)

Victor Maddern

First Tram Conductor (uncredited)

Jack May

Sailor on the Dunbar (uncredited)

George Merritt

Captain of Dunbar (uncredited)

Arthur Mullard

Seaman on the Dunbar (uncredited)

Laurence Naismith

Commissionaire (uncredited)

Campbell Singer

Station Sgt. (uncredited)

Eric Thompson

Garage Pump Attendant (uncredited)

Frederick Treves

Detective at Bank (uncredited)

Mavis Villiers

Drinking Club Blonde (uncredited)

John Warwick

Inspector Jim Moss (uncredited)

Russell Waters

Sgt. - River Police (uncredited)