| Ian Carmichael |
Jack Goddard |
| Janette Scott |
Peggy |
| Sid James (as Sidney James) |
Sid Randall |
| Liz Fraser |
Sandra March |
| Dennis Price |
Watson |
| Noel Purcell |
O'Malley |
| Naunton Wayne |
1st Thames Conservancy Officer |
| Reginald Beckwith |
Harper |
| Irene Handl |
Mrs. Harper |
| Miles Malleson |
Rev. Thomas |
| Gerald Campion |
Charlie |
| Terry Scott |
2nd River Policeman |
| Gladys Henson |
Madame de Sola |
| Michael Shepley |
Granville-Carter |
| Willoughby Goddard |
Prospective Purchaser |
| Bill Shine |
2nd Thames Conservancy Officer |
| John Harvey |
Johnnie |
| Toby Perkins |
Pukka Type |
| Jacques Cey |
French Official |
| Hedger Wallace |
1st River Policeman |
| Desmond Roberts |
Freighter Captain |
| Peter Swanwick |
Freighter Pilot |
| Graham Stark |
Flowerman |
| Marianne Stone |
Prospective Purchaser's Wife |