| Name | Character | Episodes |
|---|---|---|
| James Purefoy | David Freeman-Mitford | 6 |
| Anna Chancellor | Sydney Bowles Mitford | 6 |
| Joanna Vanderham | Diana Mitford | 6 |
| Toby Regbo | Tom Mitford | 6 |
| Calam Lynch | Bryan Guinness | 1 |
| Jamie Blackley | Peter Rodd | 1 |
| Joshua Sasse | Oswald Mosley | 1 |
| Orla Hill | Deborah Mitford | 1 |