Eric Portman
— Victor James Colebrooke
Dulcie Gray
— Anne Fielding
Derek Farr
— Jack Williams
Roland Culver
— Chief Inspector Conway
Stanley Holloway
— Sergeant Sullivan
Barbara Everest
— Mrs Colebrooke
Bonar Colleano
— Corporal Nick Mappolo
Jenny Laird
— Jeannie McLaren
Kathleen Harrison
— Florrie
Bill Shine
— Detective Ellis
Viola Lyel
— Mabel Cooper
John Salew
— Detective Walters
John Ruddock
— Glover
Edna Wood
— Miss Kemp
George Carney
— Boat Rental Agent
Mary Mackenzie
— Girl at Fair
Wilfrid Hyde-White
— Guide in Madame Tussaud's
Moira Lister
— Miss Willis
Gerhard Kempinski
— Head Waiter
Caven Watson
— Underground Attendant
Wally Patch
— Merry-Go-Round Barker
Frank Atkinson
— Chip Shop Customer
Marie Ault
— Flower Seller
Beatrice Campbell
— Muriel
Howard Douglas
— Head Park Keeper
Alexander Field
— First Newspaper Seller
Soja Ooternan
— Singer
Tony Quinn
— Mugsy Knight
Johnnie Schofield
— Chip Shop Owner
Harry Terry
— Park Keeper