 Eric PortmanVictor James Colebrooke | Victor James Colebrooke |
 Dulcie GrayAnne Fielding | Anne Fielding |
 Derek FarrJack Williams | Jack Williams |
 Roland CulverChief Inspector Conway | Chief Inspector Conway |
 Stanley HollowaySergeant Sullivan | Sergeant Sullivan |
 Barbara EverestMrs Colebrooke | Mrs Colebrooke |
 Bonar ColleanoCorporal Nick Mappolo | Corporal Nick Mappolo |
 Jenny LairdJeannie McLaren | Jeannie McLaren |
 Kathleen HarrisonFlorrie | Florrie |
 Bill ShineDetective Ellis | Detective Ellis |
 Viola LyelMabel Cooper | Mabel Cooper |
 John SalewDetective Walters | Detective Walters |
| JJohn RuddockGlover | Glover |
| EEdna WoodMiss Kemp | Miss Kemp |
 George CarneyBoat Rental Agent | Boat Rental Agent |
 Mary MackenzieGirl at Fair | Girl at Fair |
 Wilfrid Hyde-WhiteGuide in Madame Tussaud's | Guide in Madame Tussaud's |
 Moira ListerMiss Willis | Miss Willis |
| GGerhard KempinskiHead Waiter | Head Waiter |
| CCaven WatsonUnderground Attendant | Underground Attendant |
 Wally PatchMerry-Go-Round Barker | Merry-Go-Round Barker |
 Frank AtkinsonChip Shop Customer | Chip Shop Customer |
 Marie AultFlower Seller | Flower Seller |
 Beatrice CampbellMuriel | Muriel |
 Howard DouglasHead Park Keeper | Head Park Keeper |
| AAlexander FieldFirst Newspaper Seller | First Newspaper Seller |
| SSoja OoternanSinger | Singer |
| TTony QuinnMugsy Knight | Mugsy Knight |
 Johnnie SchofieldChip Shop Owner | Chip Shop Owner |
 Harry TerryPark Keeper | Park Keeper |
