Virginia McKenna as Jean Spenser

Bill Travers as Matt Spenser

Margaret Rutherford as Mrs. Fazackalee

Peter Sellers as Percy Quill

Bernard Miles as Old Tom

Francis de Wolff as Albert Hardcastle

Leslie Phillips as Robin Carter

June Cunningham as Marlene Hogg

Sid James as Mr. Hogg

George Cross as Commissionaire

George Cormack as Bell

Stringer Davis as Emmett

Michael Corcoran as Taxi Driver

Liz Fraser as Girl in Cinema (uncredited)

Peter Copley as Actor in The Mystery of Hell Valley (uncredited)

Mario Fabrizi as Actor in The Mystery of Hell Valley (uncredited)

Frazer Hines as Cast Member uncredited)

Billy Lawrence as Cast Member (uncredited)