| Name | Character | Episodes |
|---|---|---|
| Marsha Thomason | Francine Bridge | 18 |
| Robert Carlyle | Robert Sutherland | 18 |
| Victoria Hamilton | Anna Marshall | 18 |
| Lucy Cohu | Rachel Sutherland | 18 |
| David Haig | Archie Glover-Morgan | 18 |
| Richard Dormer | Fraser Walker | 12 |
| Alexa Davies | Audrey Hemmings | 12 |
| Richard Pepple | Joseph Obasi | 12 |
| Grace Hogg-Robinson | Tess Marshall | 8 |
| Marisa Abela | Ellie Sutherland | 6 |
| Emmanuel Imani | James Obubajo | 6 |
| Jane Horrocks | Victoria Dalton | 6 |
| Gregg Chillin | Nate Stevens | 6 |
| Alexandre Willaume | Edin Tosumbegovic | 6 |
| Steven Cree | Stuart Collier | 6 |