| Name | Character | Episodes |
|---|---|---|
| Charles Dance | James Latimer | 1 |
| Elizabeth Spriggs | Evelyn Smith | 1 |
| Beatie Edney | Pippa Millington | 1 |
| Joan Hickson | Miss Wainwright | 1 |
| Patricia Hodge | Margaret Tutting | 1 |
| Jane Asher | Sonia | 1 |
| Claire Bloom | Lady Penwarden | 1 |
| Trevor Howard | Sir Daniel Penwarden | 1 |
| Terence Alexander | Harry Scott-Forbes | 1 |
| Eleanor Bron | Josie Barlow | 1 |
| William Simons | Arthur Henry Strapp | 1 |
| Joanna David | Hester Peters | 1 |
| Renée Asherson | Helen, Lady Sibley | 1 |
| Rhoda Lewis | Meg Norton | 1 |
| Barbara Jefford | Monica Dawes | 1 |
| John Castle | Dr. David Warreck | 1 |
| Edward Hardwicke | Gavin Barlow | 1 |
| Sylvia Syms | Viven Scott-Forbes | 1 |
| Charles Kay | Mr. Kaufman | 1 |
| Patrick Allen | Gilbert Smith | 1 |
| Aden Gillett | Matthew Clay | 1 |
| Georgine Anderson | Christine Turner | 1 |
| Michael Jayston | Austin Tupp | 1 |
| Emrys James | Chief Inspector Dryden | 1 |
| Ian Ogilvy | Max Donaldson | 1 |
| Amanda Root | Sarah Penwarden | 1 |
| Simon Shepherd | Lawrence Penwarden | 1 |
| Janet Suzman | Avon Eve | 1 |
| Judy Campbell Exner | Hermione Tutting | 1 |
| Tim Seely | Weir | 1 |
| Alan David | Jeremy Semper | 1 |
| Emma Vansittart | Maria | 1 |