| Name | Character | Episodes |
|---|---|---|
| Hugh Bonneville | Bob Boothby | 4 |
| Jonathan Cake | Oswald 'Tom' Mosley | 4 |
| Jemma Redgrave | Cimmie Curzon | 4 |
| Flora Montgomery | Baba | 4 |
| Ralph Riach | Ramsay MacDonald | 3 |
| Windsor Davies | David Lloyd George | 3 |
| Caroline Langrishe | Jane Bewley | 1 |
| Nigel Davenport | Lord Rothermere | 1 |
| Erich Redman | Joseph Goebbels | 1 |
| Berwick Kaler | Arthur Henderson | 1 |
| Arturo Venegas | Count Grandi | 1 |
| Gresby Nash | Fruity Metcalf | 1 |
| Emma Davies | Diana Mitford Guinness | 1 |
| Emma Davies | Diana Guinness | 1 |
| Debora Weston | Maxine Elliott | 1 |
| Connor Byrne | Liam | 1 |
| Paul Jerricho | Harold Merrick | 1 |
| John D. Collins | Toastmaster | 1 |
| Jeremy Child | Maj. Bewley | 1 |
| Robert Lang | Lord Curzon | 1 |