| Name | Character | Episodes |
|---|---|---|
| Bill Nighy | Cameron Foster | 6 |
| James McAvoy | Dan Foster | 6 |
| Polly Walker | Anne Collins | 6 |
| Benedict Wong | Pete Cheng | 6 |
| David Morrissey | Stephen Collins | 6 |
| Marc Warren | Dominic Foy | 6 |
| Kelly Macdonald | Della Smith | 6 |
| John Simm | Cal McAffrey | 6 |
| Johann Myers | Sonny Stag | 6 |
| Philip Glenister | DCI William Bell | 6 |
| Amelia Bullmore | Helen Preger | 6 |
| Michael Feast | Andrew Wilson | 6 |
| Tom Burke | 4 | |
| Sean Gilder | 3 | |
| Geraldine James | 2 | |
| Shauna Macdonald | 2 | |
| Rory McCann | 1 | |
| Madeleine Potter | 1 | |
| David Ryall | 1 | |
| Michael Pennington | 1 | |
| Stuart Goodwin | 1 |