| Name | Character | Episodes |
|---|---|---|
| Ed Gaughan | Peters | 6 |
| Lydia Leonard | Caroline Lessing | 6 |
| Andy Linden | Fitz | 6 |
| Rory Kinnear | Robert Lessing | 6 |
| Rupert Everett | Dr. Hendrick | 6 |
| Mathew Baynton | William Agar | 6 |
| Marcia Warren | Mrs. Agar | 6 |
| Geoffrey McGivern | The Pub Landlord | 6 |
| Selina Griffiths | Matron | 6 |
| Tom Basden | John Sutton | 6 |
| Lisa Jackson | Mina | 3 |