| Name | Character | Episodes |
|---|---|---|
| Benedict Cumberbatch | Christopher Tietjens | 5 |
| Rebecca Hall | Sylvia Tietjens | 5 |
| Stephen Graham | Vincent MacMaster | 5 |
| Janet McTeer | Mrs. Satterthwaite | 5 |
| Rupert Everett | Mark Tietjens | 5 |
| Miranda Richardson | Mrs. Wannop | 5 |
| Roger Allam | General Campion | 5 |
| Tom Mison | Potty Perowne | 5 |
| Adelaide Clemens | Valentine Wannop | 5 |
| Rudi Goodman | Michael (8 years) | 2 |
| Tat Whalley | Army Groom | 1 |