Terry-Thomas

Lord Henry Mayley

Peter Sellers

"Wee" Sonny MacGregor

Peggy Mount

Flora Ransom

Shirley Eaton

Melissa Right

Dennis Price

Nigel Dennis

Georgina Cookson

Lady Lucy Mayley

Joan Sims

Ethel Ransom

Miles Malleson

Reverend Cedric "Daddy Bassy" Bastable

Kenneth Griffith

Porter

Bill Edwards

Bill Murphy

Henry Hewitt

Gunsmith

John Stuart

Police Inspector

David Lodge

PC Johnson

Victor Rietti

Dr Harz

Ronald Adam

Chemist (uncredited)

George Benson

Photographer (uncredited)

Tom Gill

Police Officer (uncredited)

Andy Ho

Chinese Man in Pub (uncredited)

Kenneth Kove

Man Who Lets Out Police Car's Tyre (uncredited)

Wilfrid Lawson

Walter - Contestant in T.V. Show (uncredited)

Arnold Marlé

Scientist (uncredited)

Edie Martin

Lady in Autograph Crowd (uncredited)

Gibb McLaughlin

Old Man in T.V. Show Audience (uncredited)

Marjorie Rhodes

Lady on Phone (uncredited)

Michael Ripper

J.E. Freeman - Greengrocer (uncredited)

Austin Trevor

Minister with Heart Attack (uncredited)

Jerold Wells

1st Irishman (uncredited)