George Formby as George Hepplewhite

Phyllis Calvert as Mary Wilson

Garry Marsh as Mendez

Romney Brent as Slim Selwyn

Bernard Lee as Oscar

Coral Browne as Iris

Helena Pickard as Oscar's Wife

Percy Walsh as Schwartz, spy chieftain

Diana Beaumont as Greta, hotel receptionist

Torin Thatcher as U-Boat commander

Donald Calthrop as Frederick Strickland

Hal Gordon as Alf Arbuckle, Dinky Do

Johnnie Schofield as Solicitous steward

Daniel Brown as Baker

Alec Clunes as Officer

Walter Fitzgerald as Dockside Policeman

Ian Fleming as Col. Harcourt

Jack Hobbs as Conway

James Knight as Passenger On SS Macaulay

Albert Lieven as German radio operator

Charles Paton as Simion

Lloyd Pearson as Hotel Manager

Bill Shine as Untipped steward

Ronald Shiner as Musician

Ben Williams as Radio Operator On SS Macaulay

Ian Wilson as Parker, Dinky Do