| Name | Character | Episodes |
|---|---|---|
| Benedict Cumberbatch | Stephen Ezard | 5 |
| Geraldine James | Barbara Turney | 5 |
| Robert Carlyle | David Russell | 5 |
| James Lance | Bryan Holland | 5 |
| David Calder | Lord Cawston | 5 |
| Kieran O'Brien | Wafa | 5 |
| Christopher Fulford | George Gibbon | 5 |
| Max Beesley | Michael Ezard | 5 |
| Eva Birthistle | Eleanor Brooke | 5 |
| David Harewood | Patrick Nye | 5 |
| Paul Higgins | Professor Lawrence Cooper | 5 |
| Rupert Procter | Lane | 5 |
| Anamaria Marinca | Yasim Anwar | 5 |
| Tom Fisher | Andrew Batz | 5 |
| Emil Hostina | Vucevic | 5 |
| Nicholas Sidi | Professor John Moreton | 5 |
| Ovidiu Niculescu | Bepa | 5 |