Peter Sellers
("Wee" Sonny MacGregor) ,
Ronald Adam
(Chemist (uncredited)) ,
George Benson
(Photographer (uncredited)) ,
Georgina Cookson
(Lady Lucy Mayley) ,
Shirley Eaton
(Melissa Right) ,
Tom Gill
(Police Officer (uncredited)) ,
Kenneth Griffith
(Porter) ,
Henry Hewitt
(Gunsmith) ,
David Lodge
(PC Johnson) ,
Miles Malleson
(Reverend Cedric "Daddy Bassy" Bastable) ,
Peggy Mount
(Flora Ransom) ,
Wally Patch
(Fred) ,
Dennis Price
(Nigel Dennis) ,
Victor Rietti
(Dr Harz) ,
Joan Sims
(Ethel Ransom) ,
John Stuart
(Police Inspector) ,
Terry-Thomas
(Lord Henry Mayley) , Bill Edwards (Bill Murphy) , Peter Noble (TV announcer) , Joan Hurley (Désirée Mensch aka D. Mandeville)