Alfred, Thomas and Martha become entangled in an assassination plot against Lord Harwood.
| Name | Type | Role | |
|---|---|---|---|
| Bruno Heller | Writer | ||
| Rufus Wright | Guest Star | Duke of Windermere | |
| Anna Chancellor | Guest Star | Frances Gaunt | |
| Michael Morgan-Gyekye | Guest Star | Handsome Young Butler | |
| Ramon Tikaram | Guest Star | Detective Inspector Aziz | |
| Helena Blackman | Guest Star | Duchess of Windermere | |
| Danny Webb | Guest Star | John Ripper | |
| Mark Flitton | Guest Star | Detective 1 | |
| Jessica Ellerby | Guest Star | The Queen | |
| Jennie Goossens | Guest Star | Mrs Spicer | |
| Simon Day | Guest Star | Sid Onslow | |
| Patrick Regis | Guest Star | Detective 2 | |
| Harriet Slater | Guest Star | Sandra Onslow | |
| Melissa Knatchbull | Guest Star | Lady Harwood | |
| Sarah Alexander | Guest Star | Undine Thwaite | |
| Matthew Mellalieu | Guest Star | Ghillie | |
| Peter Guinness | Guest Star | General Malcolm | |
| Paul Bigley | Guest Star | Chancellor | |
| Richard Clothier | Guest Star | Prime Minister | |
| Jon Bard | Guest Star | Prisoner | |
| Rob Bailey | Director |