| Name | Character | Episodes |
|---|---|---|
| Andrew Lincoln | Robert Bridge | 14 |
| Lesley Sharp | Alison Mundy | 14 |
| Anna Wilson-Jones | Jude Bridge | 14 |
| Saskia Reeves | 1 | |
| Natalia Tena | 1 | |
| Ed Westwick | Darren | 1 |
| Adrian Lester | 1 | |
| Nora-Jane Noone | 1 | |
| Mark Bonnar | 1 | |
| Zoe Telford | 1 | |
| Phyllida Law | 1 | |
| Nikki Amuka-Bird | 1 | |
| Mark Benton | 1 | |
| Badria Timimi | Dr. Lalita Sharma | 1 |
| Rasmus Hardiker | 1 | |
| Colin Prockter | 1 | |
| Harry Treadaway | 1 | |
| Steven Elder | 1 | |
| Rosemary Leach | 1 | |
| Michael Obiora | 1 | |
| Veronica Roberts | 1 | |
| Susan Engel | 1 | |
| Oscar James | 1 | |
| Rad Lazar | 1 |