- Tobias Menzies - Prince Philip, Duke of Edinburgh
- Marcia Warren - Queen Elizabeth the Queen Mother
- Helena Bonham Carter - Princess Margaret
- Jeremy Northam - Anthony Eden
- Anton Lesser - Harold Macmillan
- Ben Daniels - Lord Snowdon
- Gillian Anderson - Margaret Thatcher
- Victoria Hamilton - Queen Elizabeth the Queen Mother
- Jason Watkins - Harold Wilson
- Josh O'Connor - Prince Charles
- Emma Corrin - Lady Diana Spencer
- John Lithgow - Winston Churchill
- Marion Bailey - Queen Elizabeth the Queen Mother
- Erin Doherty - Princess Anne
- Stephen Boxer - Denis Thatcher
- Elizabeth Debicki - Princess Diana
- Elizabeth Debicki - Princess Diana (archive footage)
- Vanessa Kirby - Princess Margaret
- Vanessa Kirby - Young Princess Margaret (archive footage)
- Ben Miles - Peter Townsend
- Ben Miles - Young Peter Townsend (archive footage)
- Salim Daw - Mohamed Al Fayed
- Paul Thornley - Bill Mattheson
- Jo Stone-Fewings - Collins
- Daniel Betts - Ernst von Hannover
- Alice Hewkin - Jacqui Chan
- Daniel Ings - Mike Parker
- Bertie Carvel - Tony Blair
- Bertie Carvel - Robin Day
- Chloe Pirrie - Eileen Parker
- Billy Jenkins - Prince Charles
- Harry Hadden-Paton - Martin Charteris
- Clive Francis - Lord Salisbury
- Nicholas Burns - Anthony Nutting
- Lizzy McInnerny - Bobo Macdonald
- Chris Gordon - Duke of Edinburgh's Valet
- Anna Madeley - Clarissa Eden
- Mark Tandy - Cecil Beaton
- Sylvestra Le Touzel - Dorothy Macmillan
- Catherine Bailey - Elizabeth Cavendish
- David Roper - Bishop of Norwich
- Tom Durant-Pritchard - Billy Wallace
- John Heffernan - Lord Altrincham
- Gemma Whelan - Patricia Campbell
- Miles Jupp - Humphrey
- Anne Lambton - Gloria
- Dominic Applewhite - Dermot
- Edmund Digby-Jones - Junior Press Secretary
- Paul Sparks - Reverend Billy Graham
- Bodo Friesecke - Carl von Loesch
- Anna Chancellor - Lady Rosse
- Ed Cooper Clarke - Jeremy Fry
- Patrick Warner - Peter Cook
- Jodi Balfour - Jackie Kennedy
- Michael C. Hall - President Kennedy
- Danny Sapani - President Nkrumah
- Sam Crane - Patrick Plunket
- Joseph Kloska - Porchey
- Michael Bertenshaw - Master of the Household
- Richard Clifford - Norman Hartnell
- Julian Ovenden - Bobby Kennedy
- Burghart Klaußner - Kurt Hahn
- Leonie Benesch - Princess Cecilie
- August Wittgenstein - Grand Duke Georg Donatus
- Guy Williams - Prince Andrea
- Sophie Stone - Princess Alice
- Eliza Sodró - Princess Sophie
- Lewis Macleod - Iain Tennant
- Michael Fenton Stevens - Peter Beck
- Kit Redding - Young Jim Orr
- Richard Lintern - Stephen Ward
- Tim Steed - John Profumo
- Ryan Sampson - Dudley Moore
- Joshua Lacey - Jonathan Miller
- Harriet Walter - Clemmie Churchill
- Simon Chandler - Clement Attlee
- Kate Phillips - Venetia Scott
- Alan Williams - Professor Hogg
- Stephen Dillane - Graham Sutherland
- Michael Culkin - Rab Butler
- Amelia Bullmore - Kathleen Sutherland
- Andrea Deck - Jean Wallop
- Sara Vickers - Marion Crawford
- Finn Elliot - Young Prince Philip
- Clancy Brown - Lyndon B. Johnson
- Michael Simkins - Patrick Dean
- Martin McDougall - W Marvin Watson
- John Hollingworth - Porchey
- Rupert Vansittart - Cecil King
- Samuel West - Anthony Blunt
- Angus Wright - Martin Furnival Jones
- Paul Hilton - Michael Straight
- Teresa Banham - Mary Wilson
- Jim Creighton - MI5 Officer
- Christopher Naylor - Lord Snowdon's Valet
- Anthony Brophy - James Jesus Angleton
- Clayton T. Smith - American General
- Alan Gill - Winkie
- Pippa Winslow - Blinkie
- Guy Chambers - Pianist
- Ifan Huw Dafydd - Howell
- Richard Harrington - Fred Phillips
- Jack Parry-Jones - Teacher
- Dyfrig Morris - Thomas Edwards
- Gwyneth Keyworth - Gwen Edwards
- Charlotte Gray - Beryl Moss
- Alison Jones - Mary Phillips
- Charlie Baron - Rhys Edwards
- Anthony O'Donnell - Mayor of Merthyr Tyfdil
- Hugh Thomas - Bishop of Llandaff
- Dafydd Hywel - Shopkeeper
- Matthew Steer - Wilson's Aide
- Simon Armstrong - Councillor
- Steven Elliot - Geoffrey Morgan
- David Rees Talbot - Alun Jenkins
- Nicholas McGaughey - Supervisor
- Lynn Hunter - Colliery Secretary
- Colin Morgan - John Armstrong
- Michael Thomas - Duke of Gloucester
- Robert Wilfort - Documentary Director
- Lorraine Ashbourne - Barbara Castle
- Aden Gillett - Richard Crossman
- Miltos Yerolemou - Chronos
- Mark Lewis Jones - Edward Millward
- Nia Roberts - Silvia Millward
- David Rintoul - Michael Adeane
- Sinead Matthews - Marcia Williams
- David Summer - Thomas Parry
- Mark Dexter - Tony Benn
- Gala Gordon - Christine Keeler
- Felix Scott - Buzz Aldrin
- Henry Pettigrew - Neil Armstrong
- Andrew-Lee Potts - Michael Collins
- Michael Colgan - IRA Lieutenant
- Patrick Toomey - Philip's Private Secretary
- Callum Coates - Butler at Althorp
- Ronald Moger - Reporter
- Alex Harland - Newsreader
- Harriet Benson - Patricia Knatchbull
- Mark Carlisle - Lord Brabourne
- Mark Brennan - Thomas McMahon
- Rob Curling - Showjumping Commentator
- Richard Stirling - Showjumping Timekeeper
- Roy Sampson - Laurens van der Post
- Amy Searles - Kanga
- Takatsuna Mukai - Japanese Guest
- Billy Mack - Ghillie
- Laura Cairns - Balmoral Maid
- Jonathan Hansler - Balmoral Guest 1
- Jacqueline Defferary - Balmoral Guest 2
- Nicholas Day - Jim Prior
- Richard Syms - Lord Hailsham
- Peter Pacey - Lord Soames
- Guy Siner - Francis Pym
- Roger May - Cabinet Photographer
- Allegra Marland - Carolyn Pride
- Donald Douglas - Lord Chambarlaine
- Rachel Donovan - Photographer 1
- Robin Kermode - Interviewer
- Eileen Dunwoodie - Diana's Maid
- James Hillier - Buckingham Palace Equerry
- James Hillier - Equerry (Buckingham Palace)
- Will Keen - Michael Adeane
- Pip Torrens - Tommy Lascelles
- Tim McMullan - Robin Woods
- Derek Jacobi - Duke of Windsor
- Tom Burke - Dazzle Jennings
- Nicholas Farrell - Michael Shea
- Tom Brooke - Michael Fagan
- Freddie Fox - Mark Thatcher
- Rebecca Humphries - Carol Thatcher
- Karina Orr - Anne-Charlotte Verney
- Pierre Philippe - Jean Garnier
- Edward Wolstenholme - BAS Team Leader
- Oscar Foronda - Constantino Davidoff
- Simon Kirk - Andrew's Co-Pilot
- Douglas Reith - Admiral Leach
- Paul Bigley - John Nott
- Denise Mack - Jobcentre Employee
- Ed Hartland - Benefits Officer
- Clare Perkins - Social Worker
- Richard Cant - Fagan''s Local MP
- Josef Davies - Christine's Boyfriend
- David Bromley - Footman
- Sanchia McCormack - Buckingham Palace Maid 2
- David Maybrick - Security Man 1
- Richard Allinson - Radio DJ (Voiceover) (voice)
- Olivia Beardsley - Australian Make-Up Girl
- Miriam Lucia - Australian TV Reporter
- Adam Fitzgerald - Graham Evans
- Naomi Allisstone - Hazel Hawke
- Claire Foy - Queen Elizabeth II
- Claire Foy - Young Elizabeth / Young Queen Elizabeth II
- Claire Foy - Young Queen Elizabeth II (archive footage)
- Anthony Harwood - Australian Photographer
- Ryan O'Donnell - Brisbane Reporter 1
- Alistair Moulton Black - Brisbane Reporter 2
- Jayne Edwards - Brisbane Crowd Member
- Aimee Hodnett - Singer
- Kate Parr - Singer
- Harry Treadaway - Roddy Llewellyn
- Nancy Carroll - Anne Tennant
- Richard Teverson - Colin Tennant
- Gemma Jones - Penelope Carter
- Geoffrey Breton - Mark Phillips
- Madeleine Bowyer - Earlswood Nurse 1
- Andy Clarkson - Earlswood Nurse 2
- Don Gallagher - Willie Whitelaw
- Eva Feiler - Young Margaret Thatcher
- Tony Jayawardena - Sir Sonny Ramphal
- Janet Suzman - Literary Agent
- Richard Roxburgh - Bob Hawke
- Robert East - Director
- Denver Isaac - Journalist
- Peter Symonds - Hardy Amies
- Kenneth Coombs - Victoria Station Newspaper Seller
- Alana Ramsey - Sarah Lindsay
- Jay Webb - Wayne Sleep
- Luke Cinque-White - Wayne Sleep's Assistant
- Daniel Donskoy - James Hewitt
- Robert Cavanah - Psychiatrist
- Judith Paris - Wendy Mitchell
- Charlie Richards - Queen's Page
- Daniel Gosling - TV Commentator
- Charles Edwards - Martin Charteris
- Penny Downie - Duchess of Gloucester
- Angus Imrie - Prince Edward
- Richard Goulding - Edward Adeane
- Kevin McNally - Bernard Ingham
- Paul Jesson - Sir Geoffrey Howe
- Michael Buerk - Newsreader (voice)
- Georgie Glen - Ruth Lady Fermoy
- Tom Byrne - Prince Andrew
- Dominic Rowan - Charles Powell
- Tom Turner - Patrick Jephson
- David Phelan - Dickie Arbiter
- Lin Sagovsky - Elspeth Howe
- Annette Badland - Doctor Margaret Meagarty
- Vaughn Johseph - U.S. TV Reporter
- John Moraitis - New Yorker
- Reis Daniel - New Yorker
- Rayhaan Kufuor-Gray - New York Boy
- James Millard - BBC Roving Reporter
- Sam Phillips - Equerry
- Alison Pargeter - Buckingham Palace Maid 1
- Alex Barclay - Michael Howard
- Martin Fisher - Peter Lilley
- Marc Ozall - John Major
- Dugald Bruce Lockhart - John Moore
- Duncan Duff - Cecil Parkinson
- Oliver Milburn - Chris Patten
- Michael Mears - Malcolm Rifkind
- Stephen Greif - Speaker of the House
- Daniel Fraser - Queen's Equerry
- Francis Adams - Photographer
- John Humphrys - Newsreader (voice)
- Acushla-Tara Kupe - Maori Dancer
- Nicholas Rowe - Jock Colville
- Samantha Baines - Mary
- Nigel Cooke - Harry Crookshank
- Andrew Buchan - Andrew Parker Bowles
- George Asprey - Walter Monckton
- Geraldine Chaplin - Wallis Simpson
- Simon Poland - Chief Scientist (Met Office)
- Jane Lapotaire - Princess Alice
- Anthony Flanagan - Thurman
- Michael Maloney - Edward Heath
- Jamie de Courcey - Doctor
- Rebecca Benson - Nurse
- Khalid Abdalla - Dodi Fayed
- Khalid Abdalla - Dodi Fayed (archive footage)
- Stephen Chance - Director (Met Office)
- Paul Sheridan - Eden's Aide
- Timothy Dalton - Peter Townsend
- Lucas Hare - John Barratt
- Dominic Andersen - Camilla's Date
- Patrick Ryecart - Duke of Norfolk
- Ronald Pickup - Archbishop of Canterbury
- Patrick Drury - Lord Chamberlain
- John Woodvine - Archbishop of York
- James Laurenson - Doctor Weir
- Josh Cooke - Footman (Buckingham Palace)
- Paul Longley - Footman (Abbey)
- Nicholas Jones - Lord Moran
- Martin Bishop - King's Valet
- Rosalind Knight - Princess Andrew of Greece and Denmark
- David Clatworthy - Eric Sherbrook Walker
- Wayne Harrison - Governor General of Kenya
- Yule Masiteng - Chief Kungu Waruhiu
- Matt Newman - Morris
- Treasure Tshabalala - Chief Pelipel
- Edmund Wiseman - Radio Announcer
- Tom Fairfoot - Royal Detective
- Anthony Edridge - Equerry (Clarence House)
- James Woolley - Page (Marlborough House)
- Richard Walsh - Joe Gormley
- Nadia Williams - Verona Hiddleton-Jeter
- Terrence Hardiman - Doctor Evans
- Cory Peterson - Party Guest
- Clare Foster - Nancy Lewis
- John Surman - Cecil Mann, Crown Jeweller
- Freddie Meredith - Secretary (Lambeth Palace)
- Tony Guilfoyle - Bishop of Durham
- Noni Harrison - Indira Gandhi
- Bharat Mistri - Indian Diplomat
- David Gillies - Telephonist (Clarence House)
- Peter Wight - Newspaper Editor
- Nick Hendrix - Billy Wallace
- David Shields - Colin Tennant
- Ed Stoppard - Tony Longdon
- Angela Sims - Princess Margaret's Dresser
- Jo Herbert - Mary Charteris
- Ian Porter - U.S. Department Aide
- Garrick Hagon - John F. Dulles
- Héléna Soubeyrand - Marie-Antoinette de Bellaigue
- Michael Cochrane - Vice Provost Sir Henry Marten
- Arthur Nightingale - Tailor
- David Yelland - Commander Vyner
- Caroline Goodall - Lady Doris
- John Standing - Imbert-Terry
- Grant Gillespie - Messenger
- Amir Boutrous - Nasser
- Catherine Lamb - Mrs Wills
- Lucy Russell - Lady Mountbatten
- Richard Elfyn - Selwyn Lloyd
- Hugh Futcher - David Ben-Gurion
- Keenan Arrison - Egyptian Interpreter
- David Shackleton - Provost
- Lamar Bonhomme - Egyptian Colonel
- Adrian Lukis - Vice-Admiral Conolly Abel Smith
- Hanako Footman - Lily
- Mirrah Foulkes - Helen King
- Julius D'Silva - Baron Nahum
- Sam Wilkinson - Royal Australian Navy Officer
- Beau Gadsdon - Young Margaret
- Beau Gadsdon - Young Princess Margaret
- Simon Paisley Day - Meryn Lewis
- Martin Chamberlain - Aneurin Bevan
- Attila Bardóczy - French Orderly
- Pip Carter - Colin Tennant
- Paul Clayton - Bob Boothby
- Yolanda Kettle - Camilla Fry
- Douggie McMeekin - Sunny Blandford
- Matthew Marsh - President Eisenhower
- Jeffrey Ho - Sultan of Perak's Interpreter
- David Shaw-Parker - Hawker
- Jack Chissick - Vendor
- Peter Sandys-Clarke - BBC Producer
- Jonathan Rhodes - Impact Producer
- Euan Macnaughton - Lord Caithness
- James Greene - Royal Horological Conservator
- Des McAleer - Philip Kinghorn Burbidge
- Greg Lockett - US Military Courier
- Matt Rippy - US Intelligence Officer
- Ian Hallard - Analyst
- Rebecca Saire - Baba Metcalfe
- William Tapley - Base Commander
- Ed Eales White - Foreign Office Translator
- Matthew Bates - Deputy Under-Secretary
- Michael Sheldon - Alec Cadogan
- Yves Aubert - French Historian
- Matt Blair - American Historian
- Stella Gonet - Margaret Lambert
- Tristan Sturrock - John Wheeler-Bennett
- Janet Henfrey - Vita Sackville-West
- Gareth Marks - Fruity Metcalfe
- Miles Richardson - George Allen
- Robert Irons - Freddie Bishop
- Oliver Maltman - Jim Orr
- David Annen - Alec Douglas-Home
- James Borthwick - Leonid Brezhnev
- Barnabás Tóth - French Diplomat
- James Garnon - Stanislaw Radziwill
- Jeremy Wheeler - Doctor Jacobson
- Jacques Boudet - President de Gaulle
- Martin Marquez - Royal Detective
- Clive Flint - Arthur Cunningham
- Péter Fancsikai - German Passport Officer
- Maximilian Dirr - Junkers Pilot
- Péter Barbinek - German Valet
- Michael Eaves - Dean of Windsor
- Clare Holman - Princess Marina
- Tom Lawrence - Reporter
- Peter Forbes - Barrister
- Elliot Cowan - Norton Knatchbull
- Andrew Havill - Robert Fellowes
- Alastair Mackenzie - Richard Aylard
- Theo Fraser Steele - Timothy Laurence
- Jamie Glover - Patrick Jephson
- James Murray - Prince Andrew
- Sam Woolf - Prince Edward
- Robert Portal - Dr Nigel Southward
- Flora Montgomery - Norma Major
- Andrew Steele - Andrew Morton
- Christopher Villiers - Rear Admiral Woodard
- Spyros Bibilas - John Latsis
- Helen Ryan - Queen's Dresser
- Alex Blake - Stephen Lamport
- Hanna Alström - Heini Wathén
- Ben Lloyd-Hughes - Mark Bolland
- Erin Richards - Kelly Fisher
- Adonis Kapsalis - Captain Fletcher
- Lydia Leonard - Cherie Blair
- Harry Anton - Trevor Rees-Jones
- Max Dowler - Naval Equerry
- Adam Damerell - Alastair Campbell
- Thomas Nelstrop - Jonathan Powell
- Oliver Chris - James Colthurst
- Christopher Ravenscroft - Page (Buckingham)
- Christopher Ravenscroft - Page (Sandringham)
- Joanna Ignaczewska - Polish Interviewer
- Jacqui-Lee Pryce - St Thomas's Nurse
- Andre Nightingale - Kensington Palace Police Officer
- Dallas Campbell - Morton's Interviewer
- Nigel Barber - American News Anchor 1
- Andromeda Godfrey - American News Anchor 2
- Jude Akuwudike - Sydney Johnson
- Jonathan Newth - Page (Buckingham Palace)
- Jonathan Newth - Buckingham Palace Page
- Ryan Early - Television Producer
- Ryan Early - Radio Producer
- Amir El-Masry - Young Mohamed Al Fayed
- Philippine Leroy-Beaulieu - Madame Ritz
- Martin Turner - Lord Chamberlain
- Abdelatif Hwidar - Aly Aly Fayed
- Mohamed Kamel - Ali Fayed
- Peter Ellis - Sandringham Gamekeeper
- Peter Ellis - Land Agent
- Carolina Lopes - Ritz Manager
- Victor Solé - Football Referee
- Ahmed Ghozzi - Adnan Khashoggi
- Philip Delancy - Director of Ritz Board
- Joshua Kekana - Young Sydney Johnson
- Karine Ambrosio - Marie-Luce Townsend
- David Killick - Mess President
- Peter Harding - Senior Naval Officer
- Gary Pillai - Chief Fire Officer
- Victor McGuire - Amateur Radio Operator
- Ben Warwick - Jonathan Dimbleby
- Daniel Flynn - Andrew Parker Bowles
- Marty Cruikshank - Dowager Duchess of Westminster
- Claire Vousden - Guest at Eaton Lodge
- Alan Blyton - Editor-in-Chief
- ???????? ??????? - Boris Yeltsin
- Richard Dillane - King George V
- Anja Antonowicz - Tsarina Alexandra
- Anastasia Everall - Olga Romanov
- Julia Haworth - Tatiana Romanov
- Oleg Mirochnikov - Dr Botkin
- Gediminas Adomaitis - Yakov Yurovsky
- Marina Shimanskaya - Naina Yeltsina
- Charlotte Pyke - Queen Elizabeth's Interpreter
- Nicholas Lumley - Lord Stamfordham
- Prasanna Puwanarajah - Martin Bashir
- Humayun Saeed - Hasnat Khan
- Philip Cumbus - Charles Spencer
- Michael Jibson - Steve Hewlett
- Olwen Fouéré - Oonagh Shanley-Toffolo
- Hannah Donaldson - Ward Nurse
- Patrick Pearson - Provost of Eton
- Blake Ritson - Andrew Gailey
- Nicholas Gleaves - John Birt
- Richard Cordery - Duke Hussey
- Haydn Gwynne - Lady Susan Hussey
- Stephen Cavanagh - Michael Robinson
- Gerard Fletcher - Tony Poole
- Jeany Spark - Birt's Assistant
- Danielle Fiamanya - Carol Kenyon
- Lynette Edwards - Lady Abel Smith
- Andrew Mayer - Theatre Manager
- Nancy Crane - Lady Airlie
- Susan Brown - Lady Dugdale
- Alison Skilbeck - Lady Elton
- Julie Neubert - Mary Morrison
- Marcus Brigstocke - Doctor
- Layo-Christina Akinlude - Barbara Anderson
- Marcus Onilude - Anthony Anderson
- Claire Brown - Linda Lawson
- David Ganly - Richard Lawson
- Jason Bailey - Mark Turner
- Carlyss Peer - Sophie Turner
- Annabel Mullion - Fiona Shackleton
- Virge Gilchrist - Hilary Browne-Wilkinson
- Nigel Whitmey - Marquis Childs
- Ben Stylianou - Pawnbroker
- Colin Stinton - Lawrence E. Spivak
- Chris Kyriacou - Police Chief
- Georgina Strawson - Buckingham Palace Maid
- Julian Glover - Cecil Boyd-Rochfort
- Harry Gostelow - Mountbatten's Valet
- Jasper Jacob - Bank of England Lawyer
- John Finn - Arthur 'Bull' Hancock
- Stuart McQuarrie - George Thomson
- Alan David - Ben Bowen Thomas
- Alice White - Bethan
- Sidney Jackson - Prince Edward
- Jonathan Broadbent - James Burke
- Fred Broom - Cliff Michelmore
- Daniel Beales - Patrick Moore
- William Ellis - Queen's Flight Captain
- Kevin Eldon - Priest Michael
- Steven Blake - Buckingham Palace Press Secretary
- Steven Blake - Palace Press Secretary
- Simon Connolly - Marvin Miles
- Jonathan Coote - Priest 1
- Sam Parks - Priest 2
- Andrew Buckley - Priest 3
- James Sobol Kelly - American Journalist 1
- Lucy Newman-Williams - American Journalist 2
- Olivier Raynal - French Journalist
- Penelope McGhie - Henrietta Woods
- Dai Tabuchi - Japanese Journalist
- David Wilmot - Arthur Scargill
- Stephen Riddle - Derek Parker Bowles
- Judith Alexander - Ann Parker Bowles
- Robert Benedetti-Hall - Major Bruce Shand
- Nesba Crenshaw - Rosalind Shand
- Peter Ormond - Captain
- Richard Sutton - Gunnery Instructor
- Jamie Chapman - Reporter
- Jessica De Gouw - Lucy Lindsay-Hogg
- Martin Wimbush - Dr. Bodley Scott
- Dan Renton Skinner - Alastair Burnet
- Johnny Vivash - Mustique Photographer
- Guy Oliver-Watts - Lord Chamberlain
- Jared Harris - King George VI
- Josie Kidd - Secretary
- Lia Williams - Wallis Simpson / Wallis, Duchess of Windsor
- Alex Jennings - David, Duke of Windsor
- Greg Wise - Lord Mountbatten
- Matthew Goode - Tony Armstrong-Jones
- Emerald Fennell - Camilla Shand / Camilla Parker Bowles
- Charles Dance - Lord Mountbatten
- Natascha McElhone - Penny Knatchbull
- John Rowe - Chief Telephonist (Buckingham Palace)
- John Sackville - S.I.S. Controller
- Bongo Mbutuma - Outspan Hotel Manager
- Philip Philmar - Embalmer
- Ivy Nkutha - Treetops Housekeeper
- Sarah Muhoho - Sagana Lodge Housekeeper
- Robin Bowerman - Page (Rhodesia)
- Clive Arrindell - Newspaper Proprietor
- Andrew Bone - F.O. Aide
- Amy Doyle - Colville's Secretary
- Todd Boyce - U.S.A.F. General
- Thom Tuck - Journalist #1
- Garry Lake - Journalist #2
- Paul Baker - Journalist #3
- Abigail Parmenter - Judy Montague
- Adam Stevenson - Ghillie
- Alec Nicholls - Downing Street Aide
- Linda Small - Elderly Ghanaian Servant
- Richard Rycroft - Archbishop of Canterbury
- Richard Rycroft - Archbishop of Canterbury / Archbishop Carey
- Edward Tidy - Junkers Crew Member
- Roderick Gilkison - Simon Harper's Friend
- Peter Straker - Elevator Operator
- Luke Juby - Jazz Band Musician
- Rebecca Harries - Local Woman 1
- Michelle McTernan - Local Woman 3
- Mark Lewis - Local Man 1
- Rhys Parry Jones - Local Man 2
- Grahame Fox - Worker 1
- Jason May - Worker 2
- Simon Nehan - Worker 3
- Tony Bill - Guardian Editor
- Michael Parker - Documentary Narrator (voice)
- Roger Evans - Editor
- Andrew Cullum - Race Commentator
- Graham Vanas - Doorman
- Milly Thomas - Mirror Group Secretary
- Clifford Rose - Dean of Windsor
- Togo Igawa - Emperor Hirohito
- Pierre Azéma - French Doctor
- Alasdair Craig - Co-Pilot
- Gerrard McArthur - Garter at Arms
- Richard Shanks - Clarence House Equerry
- Patrick McBrearty - Francis McGirl
- David Kerr - Showjumping Judge
- Olivia Williams - Camilla Parker Bowles
- Stéphanie Magnin - Italian Tour Guide
- Jonathan D. Mellor - Guest Historian
- John Conroy - Desert Island Discs Presenter
- Alex Kovas - Russian Guard 2
- Nigel Anthony - Prince Philip's Friend
- Anna Danshina - Prince Philip's Interpreter
- Vivien Bridson - Walking Patient
- Kate Bone - Mediator 2
- Sheenal Kothari - Mediator 3
- Josh Taylor - Johnny Dalkeith
- Tim Bentinck - John Betjeman
- Tim Bentinck - Porchey
- Rufus Kampa - Young Prince William
- Fflyn Edwards - Young Prince Harry
- Adam Best - Journalist Nick
- Jamie Baughan - Journalist Gordon
- Philippe Spall - Parisian Dog Walker
- Jana Quiles - Jasmine Fayed
- Jack Harrison - Page
- Sebastian Blunt - Prince Edward
- Jamie Parker - Robin Janvrin
- Enzo Cilenti - Mario Brenna
- Forbes Masson - Duncan Muir
- Michelle Andrade - Bianca, Jonikal Maid
- Amira Ghazalla - Salma, Mohamed's Secretary
- Darren Swift - Ken Rutherford
- Kirstin Murray - Edith Muir
- Emma Stansfield - Kensington Palace Maid
- Kate Cook - Susie Orbach
- Yoann Blanc - Henri Paul
- Ben Lambert - Ben Murrell
- Paul Gorostidi - Philippe Dourneau
- Emma Hindle - Balmoral Maid
- Ewan Black - Balmoral Operator
- Justine Mitchell - Sarah McCorquodale
- Annette Flynn - Jane Fellowes
- Charlotte Melia - Anji Hunter
- Eric Colvin - Michael Jay
- Christophe Guybet - Jean-Pierre Chevènement
- Laurent C. Lucas - Jacques Chirac
- Eileen Atkins - Queen Mary
- Jack Cunningham-Nuttall - Fergus Boyd
- Isaac Rouse - Ollie Chadwyck-Healey
- Baxter Westby - Eton Boy 3
- Joseph Elliott - Eton Teacher
- Paige Edwards - Teenage Girl 1
- Bella Padden - Teenage Girl 2
- Stewart Alexander - Space Centre Professor
- Polly Frame - Sally Morgan
- Christopher Staines - Warden of the Swans
- Barry McCarthy - Yeoman of the Glass and China
- Lisa Armytage - Berkshire WI Chair
- Paul Besterman - Footman with Corgis
- Abigail Davies - Pollster 1
- Paul Beeson - Pollster 2
- Andrew Caley - Pollster 4
- Meghan Treadway - Pollster 5
- Bobby Rainsbury - Pollster 6
- Carol Walton - London Participant 1
- Dean Kilbey - London Participant 2
- Karl Queensborough - London Participant 4
- Scott Ainslie - Edinburgh Cohort 1
- Eliza Langland - Edinburgh Cohort 3
- Jamie Newall - Edinburgh Cohort 4
- Everal Walsh - Leeds Cohort 4
- Eve Best - Carole Middleton
- Meg Bellamy - Kate Middleton
- Tim Dutton - Michael Middleton
- Daniel Burt - James Middleton
- Honor Swinton Byrne - Lola Airdale-Cavendish-Kincaid
- Oli Green - Finchey
- Charlie Beaven - Charlie Nelson
- Andy Brady - Eton Journalist 1
- Ellouise Shakespeare-Hart - Eton Journalist 2
- Lila Clements - Eton Journalist 3
- Sorel Johnson - Eton Invigilator
- Paul Sparkes - William's PPO
- Liz Kettle - Tutor - Jocelyn Cooper
- Eugenia Caruso - Tutor - Cristina Rossi
- Jon Glover - Lecturer - Barlow
- John Mackay - St. Andrews Librarian
- Matt Ingram-Jones - Glosse Posse 1
- Thea Collings - Highgrove Journalist 3
- Imogen Stubbs - Anne Tennant
- Ira Mandela Siobhan - American GI
- Stuart Milligan - Harding Lawrence
- Daniel Costello - Ned Ryan
- Thea Balich - Margaret's Maid
- Tristan Gemmill - Dr Richard Thompson
- Eric James Gravolin - Upper-Class Officer
- Jamie Kenna - Doorman
- Lorcan Cranitch - Commissioner Stevens
- Christina Cole - Interviewer
- Darren Hill - DCS Dave Douglas
- Andrew Lewis - Canon Ovenden
- Crispin Letts - Crowthorne Forensics Expert
- Jon Arne Arnseth - Crowthorne Computer Expert
- James Payton - Geography Lecturer
- Cia Allan - Modern History Lecturer
- Oscar Lesage - Guy Pelly
- Gina Beck - Helen Asprey - Private Secretary
- Tommy Rodger - Hugo - Party Guest
- Jonathan Hyde - Duke of Norfolk
- Richard Heap - Archbishop Williams
- Julian Wadham - David Stancliffe
- Paul Tinto - Piper to the Sovereign
- James Coutsavlis - Party Guest 2
- Lizzie Hopley - Angela Kelly - Queen's Dresser
- Oscar Morgan - Shooting Friend
- Anthony Calf - Royal Photographer
- Bert Seymour - Tom Parker Bowles
- Rebecca Forsythe - Maid
- Simon Tcherniak - Charles' PPO
- Cliff Barry - Detective
- Peter Morgan
- Robert Fox
- Suzanne Mackie
- Robert Sterne
- Geoff Walton
- Lynsey Muir
- Mark Walledge
- Olga Fitzroy
- Saoirse Christopherson
- Anna Wright
- Rupert Gregson-Williams
- Andrew Skeet
- Lee Walpole
Helena Bonham Carter hace el papel de Princess Margaret.
Charles Dance interpreta a Lord Mountbatten en la serie.
Richard Elfyn interpreta a Selwyn Lloyd en la serie.
Burghart Klaußner hace el papel de Kurt Hahn.
Geraldine Chaplin interpreta a Wallis Simpson en la serie.
Kevin McNally hace el papel de Bernard Ingham.
Richard Lintern interpreta a Stephen Ward en la serie.
Derek Jacobi interpreta a Duke of Windsor en la serie.
Rupert Vansittart interpreta a Cecil King en la serie.
Stuart McQuarrie hace el papel de George Thomson.
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