| Name | Character | Episodes |
|---|---|---|
| Toby Jones | Francis Brooke | 1 |
| Adrian Rawlins | Paul Stinchcombe | 1 |
| Kenneth Branagh | Colonel Tim Collins | 1 |
| Tom Conti | Adolfo Aguilar Zinser | 1 |
| Patrick Malahide | Greenstock | 1 |
| Stephen Rea | General Tim Cross | 1 |
| Art Malik | Abdul Aziz Al-Hakim | 1 |
| Harriet Walter | Anne Campbell | 1 |
| Shelley Conn | Eesha | 1 |
| Juliet Stevenson | Elizabeth Wilmshurst | 1 |
| Kate Ashfield | Veronica Purkiss | 1 |
| Ron Cook | Peter | 1 |
| Stuart Graham | Beattie | 1 |
| Igal Naor | Ahmed Chalabi | 1 |
| Abhin Galeya | Mamoon | 1 |
| Alex Jennings | Vincent | 1 |
| Josef Altin | Young Lad | 1 |
| Michael Elwyn | Michael Jay | 1 |
| Ansu Kabia | Charlie | 1 |
| Lucy Montgomery | Natalie Fay | 1 |
| Gethin Anthony | Minister's Aid | 1 |
| Obi Abili | James | 1 |
| Kerry Shale | Eric Howlitt | 1 |
| Stephen Noonan | Roger Corke | 1 |