| Name | Character | Episodes |
|---|---|---|
| Charlotte Riley | Holly Evans | 6 |
| David Schofield | Chris Cartwright | 6 |
| David Suchet | George Emmerson | 6 |
| Ben Chaplin | Duncan Allen | 6 |
| Paapa Essiedu | Ed Washburn | 6 |
| Ellie Kendrick | Leona Manning-Lynd | 6 |
| Al Weaver | James Edwards | 6 |
| Natasha Little | Sarah Allen | 6 |
| Priyanga Burford | Amina Chaudury | 6 |
| Hebe Beardsall | Grace | 1 |