Kenneth Connor as Ordinary Seaman Blissworth

Eric Barker as Capt. David Foster

Leslie Phillips as Lt. Cmdr. Bill Fanshawe

Joan Sims as Ann Foster

Noel Purcell as Adm. Sir Humphrey Pettigrew

Hattie Jacques as Agatha Potter

Spike Milligan as Ranjid - Civilian electrician #1

Eric Sykes as Civilian electrician #2

Sid James as Chief Petty Officer Mundy

David Lodge as Security sergeant

Victor Maddern as Sailor fishing for bike

Ed Devereaux as Cmdr. Phillips

Robin Ray as Flag lieutenant

George Street as Second Security Guard

Peter Howell as Admiral's secretary

Peter Byrne as Sailor

Arch Taylor as Coxswain

Michael Brennan as Security Guard

Leila Williams as WREN Driver

Richard Bennett as Officer of the Day

Carl Conway as Sailor

Rory MacDermot as Security Guard

Jack Smethurst as Sailor

Dickie Owen as Sailor

Bill Cartwright as Sailor

Ivor Danvers as Sailor

Charles Vance as Sailor

Michael Nightingale as Sailor

Eric Corrie as Engineering Officer