| Claire Foy | Queen Elizabeth II |
| Matt Smith | Philip, Duke of Edinburgh |
| Victoria Hamilton | Queen Elizabeth The Queen Mother |
| Vanessa Kirby | Princess Margaret |
| Alex Jennings | David, Duke of Windsor |
| Harriet Walter | Clemmie Churchill |
| John Lithgow | Winston Churchill |
| Nicholas Rowe | Jock Colville |
| Pip Torrens | Tommy Lascelles |
| Harry Hadden-Paton | Martin Charteris |
| Ben Miles | Peter Townsend |
| Daniel Ings | Mike Parker |
| Lizzy McInnerny | Bobo Macdonald |
| Lia Williams | Wallis Simpson |
| Paul Thornley | Bill Mattheson |
| Will Keen | Michael Adeane |
| Patrick Drury | Lord Chamberlain |
| John Rowe | Chief Telephonist (Buckingham Palace) |
| Jonathan Newth | Page (Buckingham Palace) |
| Steven Blake | Buckingham Palace Press Secretary |
| David Gillies | Telephonist (Clarence House) |
| Peter Wight | Newspaper Editor |
| Nick Hendrix | Billy Wallace |
| Josh Taylor | Johnny Dalkeith |
| David Shields | Colin Tennant |
| Ben Fox | Princess Margaret's Private Secretary |
| Thomas Padden | Page (Clarence House) |
| Julius D'Silva | Baron Nahum |
| Jeannie Kinkaid | Telephonist (Sandringham Stables) |
| Ed Stoppard | Tony Longdon |
| Robin Bowerman | Page (Rhodesia) |
| Chris Gordon | Duke of Edinburgh's Valet |
| Angela Sims | Princess Margaret's Dresser |
| Clive Arrindell | Newspaper Proprietor |
| Mikaél Frimpong | Messenger |
| Jemma Lewis | Main Switchboard Operator |
| Teddy Lewis | Groundskeeper |
| Jonathan Wayre | Projectionist |
| Lasco Atkins | Club member |
| Nick Davison | Airport Spectator |
| Hugh O'Brien | Government Telephonist |
| Max Sinclair | 3rd Telephonist Rhodesia |
| Robert Strange | F.O. Telephonist |