| Name | Character | Episodes |
|---|---|---|
| John Carlisle | 52 | |
| Ray Barrett | 52 | |
| Frazer Hines | 52 | |
| John Arnatt | 52 | |
| John Carson | 52 | |
| Caroline Blakiston | 52 | |
| Sheila Fearn | 52 | |
| Charles Tingwell | Doctor Alan Dawson | 52 |
| John Alderton | 52 | |
| Dandy Nichols | 52 | |
| Kathleen Byron | 52 | |
| Erik Chitty | 52 | |
| Pauline Yates | 52 | |
| Stella Tanner | 52 | |
| Glyn Owen | 52 | |
| John Crocker | 52 | |
| Richard Thorp | 52 | |
| Hilary Tindall | 52 | |
| John Barron | 52 | |
| Terence Longdon | Freddy Waters | 1 |
| Norman Mitchell | Mr. Snelling | 1 |
| Paddy Ward | Mr. Booker | 1 |
| Simon Oates | Mr. Gosse | 1 |