- Sylvia Syms - Lavinia Pinkerton
- Russell Tovey - PC Terence Reed
- Hugo Speer - James Abbot
- Shirley Henderson - Honoria Waynflete
- Margo Stilley - Bridget Conway
- Steve Pemberton - Henry Wake
- Benedict Cumberbatch - Luke Fitzwilliam
- Anna Chancellor - Lydia Horton
- Jemma Redgrave - Jessie Humbleby
- Lyndsey Marshal - Amy Gibbs
- David Haig - Major Hugh Horton
- Tim Brooke-Taylor - Dr. Edward Humbleby
- James Lance - Dr. Geoffrey Thomas
- Ian Weichardt - Young Lomax
- Edward Fox - Caterham
- Mathew Horne - Eversleigh
- Adam Godley - Lomax
- Charlotte Salt - Virginia
- Jonas Armstrong - Cade
- Michelle Collins - Treadwell
- Anthony Higgins - Count Ludwig Von Stainach
- Dervla Kirwan - Bundle
- Ruth Jones - Blenkinsopp
- Alex Knight - Jaffers
- Stephen Dillane - Finch
- Letty Butler - Young Treadwell
- Nicci Brighten - Madeleine
- Jana Carpenter - May Ainsworth
- Zoe Telford - Emily Trephusis
- Holly Valance - Kanga
- Ian Richardson - Conway Jefferson
- Tara Fitzgerald - Adelaide Jefferson
- Jamie Theakston - Mark Gaskell
- Florence Hoath - Pamela Reeves
- James Fox - Colonel Arthur Bantry
- Simon Callow - Colonel Melchett
- Ben Miller - Basil Blake
- Emma Cooke - Dinah Lee
- Robin Soans - Dr. Haydock
- Bruce Mackinnon - Scamper
- Jack Davenport - Superintendent Harper
- Mary Stockley - Josie Turner
- Emma Williams - Ruby Keene
- Adam Garcia - Raymond Starr
- David Walliams - George Bartlett
- Richard Durden - Mr. Prestcott
- Tina Martin - Middle Aged Woman
- Zoe Thorne - Florence
- Greg Bennett - Police Constable
- Laurence Richardson - Hotel Guest
- Miles Richardson - Frank Jefferson
- Timothy Dalton - Clive Trevelyan
- Robert Hardy - Winston Churchill
- Laurence Fox - James Pearson
- Mel Smith - John Enderby
- Rita Tushingham - Miss Elizabeth Percehouse
- James Wilby - Stanley Kirkwood
- Paul Kaye - Dr. Ambrose Burt
- Michael Brandon - Martin Zimmerman
- Carey Mulligan - Violet Willett
- Patricia Hodge - Mrs. Evadne Willett
- Matthew Kelly - Donald Garfield
- Christian Coulson - Edmund Swettenham
- Cherie Lunghi - Sadie Swettenham
- Robert Pugh - Colonel Easterbrook
- Keeley Hawes - Phillipa Haymes
- Zoë Wanamaker - Letitia Blacklock
- Claire Skinner - Amy Murgatroyd
- Frances Barber - Lizzie Hinchcliffe
- Elaine Paige - Dora Bunner
- Matthew Goode - Patrick Simmons
- Sienna Guillory - Julia Simmons
- Catherine Tate - Mitzi Kosinski
- Christian Rubeck - Rudi Schertz
- Alexander Armstrong - D.I. Dermot Craddock
- Virginia McKenna - Belle Goedler
- Julian Morris - Dennis Clement
- Tom Hughes - Mike Rogers
- Montserrat Lombard - Esther Walters
- Polly Walker - Bess Sedgwick
- Stephen Mangan - Inspector Larry Bird
- Francesca Annis - Lady Selina Hazy
- Martine McCutcheon - Jane Cooper
- Vincent Regan - Mickey Gorman
- Mark Heap - Mr. Humpries
- Emily Beecham - Elvira Blake
- Charles Kay - Canon Pennyfather
- Denis Lawson - Leo Argyle
- Miriam Margolyes - Mrs. Price-Ridley
- Derek Jacobi - Colonel Protheroe
- Rachael Stirling - Griselda Clement
- Janet McTeer - Anne Protheroe
- Angela Pleasence - Miss Hartnell
- Jane Asher - Mrs. Lester
- Tim McInnerny - Rev Leonard Clement
- Christina Cole - Lettice Protheroe
- Mark Gatiss - Ronald Hawes
- Robert Powell - Dr. Haydock
- Kimberley Nixon - Louisa Oxley
- Julia Sawalha - Mrs. Cresswell
- Martin Compston - Alfred Pollock
- John Gordon Sinclair - Inspector Welch
- Robert Glenister - Father Brophy
- Judy Parfitt - Cicely Beauclerk
- Fiona Shaw - Miss Katherine Greenshaw
- Vic Reeves - Walter Cracken
- Joanna David - Grace Ritchie
- Sam Reid - Nat Fletcher
- Russ Abbot - CI Arthur Primer
- Geraldine Chaplin - Mrs Fane
- Dawn French - Janet Erskine
- Phil Davis - Kennedy
- James D'Arcy - Jerry Burton
- Ken Russell - Rev Caleb Dane Calthrop
- Frances de la Tour - Mrs. Maud Dane Calthrop
- Anthony Andrews - Tommy
- Greta Scacchi - Tuppence
- Camilla Arfwedson - Rose Humbleby
- Stephen Churchett - Coroner
- Steven Hartley - George Rogers
- Sean Biggerstaff - Bobby Attfield
- Georgia Tennant - Frankie Derwent
- Richard Briers - Wilson
- Rik Mayall - Alec Nicholson
- Natalie Dormer - Moira Nicholson
- Rafe Spall - Roger Bassington
- Mark Williams - Commander Peters
- Hannah Murray - Dorothy Savage
- Freddie Fox - Tom Savage
- Helen Lederer - Marjorie Attfield
- Siwan Morris - Florrie
- David Buchanan - John Carstairs
- Caroline Catz - Hazel
- Mica Paris - Amelia Walker
- Lee Ingleby - DC Colin Hards
- Richard E. Grant - Raymond West
- Dan Stevens - Michael Faber
- Laura Michelle Kelly - Verity Hunt
- Graeme Garden - Matthew Broadribb
- Ruth Wilson - Georgina Barrow
- Johnny Briggs - Sydney Lumley
- George Cole - Laurence Raeburn
- Ronni Ancona - Amanda Dalrymple
- Adrian Rawlins - Derek Turnbull
- Emily Woof - Rowena Waddy
- Will Mellor - Martin Waddy
- Amanda Burton - Sister Clotilde
- Griff Rhys Jones - Dr David Quimper
- David Warner - Luther Crackenthorpe
- Niamh Cusack - Emma Crackenthorpe
- Ben Daniels - Alfred Crackenthorpe
- Charlie Creed-Miles - Harold Crackenthorpe
- Ciarán McMenamin - Cedric Crackenthorpe
- Pam Ferris - Elspeth McGillicuddy
- Tim Stern - Attendant
- Michael Landes - Bryan Eastley
- Toby Marlow - James Stoddard-West
- Rob Brydon - Inspector Awdrey
- Rose Keegan - Lady Alice
- Pip Torrens - Noël Coward
- Amanda Holden - Lucy Eyelesbarrow
- John Hannah - Inspector Tom Campbell
- Celia Imrie - Madame Joilet
- Neve McIntosh - Martine
- Gugu Mbatha-Raw - Tina Argyle
- Burn Gorman - Jacko Argyle
- Lindsay Duncan - Marina Gregg
- Gene Goodman - Louis Charles
- Isabella Parriss - Marie Thérèse
- Jonny Coyne - French Officer
- Joanna Lumley - Dolly Bantry
- Nigel Harman - Jason Rudd
- Victoria Smurfit - Ella Blunt
- Brennan Brown - Hailey Preston
- Caroline Quentin - Heather Badcock
- Martin Jarvis - Vincent Hogg
- Hannah Waddingham - Lola Brewster
- Olivia Darnley - Cherry Baker
- Michele Dotrice - Mrs. Hubbard
- Charlotte Riley - Margot Bence
- Don Gallagher - Man in Livery
- Neil Stuke - Dr. Haydock
- Hugh Bonneville - Inspector Hewitt
- Samuel Barnett - Sergeant Tiddler
- Will Young - Casey Croft
- Anna Andresen - Maisie Cooper
- Rufus Jones - Horace Bindler
- Talulah Riley - Megan Hunter
- Claire Bloom - Aunt Ada
- June Whitfield - Mrs. Lancaster
- Nicholas Parsons - Father Gorman
- Lynda Baron - Mrs. Coppins
- Elizabeth Rider - Mrs. Davis
- JJ Feild - Paul Osbourne
- Jodie Hay - Bertie
- Jason Merrells - Dr. Kerrigan
- Neil Pearson - Inspector Lejeune
- Jonathan Cake - Mark Easterbrook
- Nigel Planer - Mr. Venables
- Jenny Galloway - Bella
- Susan Lynch - Sybil Stamfordis
- Pauline Collins - Thyrza Grey
- Tom Ward - Captain Cottam
- Sarah Alexander - Lydia Harsnet
- Amy Manson - Ginger Corrigan
- Mike Shepherd - Chief Mummer
- Holly Willoughby - Goody Carne
- Bill Paterson - Bradley
- Pippa Bennett-Warner - Victoria
- Charity Wakefield - Molly Kendall
- Robert Webb - Tim Kendall
- Warren Brown - Jackson
- Alastair Mackenzie - Colonel Hillingdon
- Hermione Norris - Evelyn Hillingdon
- Charles Mesure - Greg Dyson
- MyAnna Buring - Lucky Dyson
- Kingsley Ben-Adir - Errol
- Antony Sher - Rafiel
- Oliver Ford Davies - Major Palgrave
- Daniel Rigby - Canon Prescott
- Andrea Dondolo - Mama Zogbe
- Joe Vaz - Sergeant Weston
- Anele Matoti - Inspector Daventry
- Jeremy Crutchley - Ian Fleming
- Charlie Higson - James Bond
- Laura Haddock - Miss Grosvenor
- Julian Sands - Thomas Royde
- Greg Wise - Nevile Strange
- Eileen Atkins - Lady Tressilian
- Guy Williams - Dr Lazenby
- Julian Wadham - Kevin Halliday
- Emilio Doorgasingh - Sergeant Desai
- Sophia Myles - Gwenda Halliday
- Aidan McArdle - Hugh Hornbeam
- Harry Treadaway - George Erskine
- Richard Bremmer - Mr Sims
- Anna-Louise Plowman - Helen Marsden
- Harriet Walter - Duchess
- Greg Hicks - Ferdinand
- Peter Serafinowicz - Walter Fane
- Una Stubbs - Mrs Pagett
- Helen Coker - Lily Tutt
- Paul McGann - Dickie Erskine
- Nickolas Grace - Lionel Luft
- Sarah Parish - Evie Ballantine
- Martin Kemp - Jackie Afflick
- Vince Leigh - Jim Tutt
- Kelly Brook - Elsie Holland
- Steven Berkoff - Mr. Eccles
- Charles Dance - Septimus Bligh
- Leslie Phillips - Sir Philip Starke
- Charlie Palmer
- Tom Shankland
- Andy Wilson
- Kevin Elyot
- Charlie Higson
- Tim Whitnall
- Agatha Christie
- Dominik Scherrer
James Fox hace el papel de Colonel Arthur Bantry.
Steven Berkoff hace el papel de Mr. Eccles.
David Warner interpreta a Luther Crackenthorpe en la serie.
Charles Dance interpreta a Septimus Bligh en la serie.
Shirley Henderson hace el papel de Honoria Waynflete.
Adrian Rawlins interpreta a Derek Turnbull en la serie.
Ian Richardson interpreta a Conway Jefferson en la serie.
Sophia Myles interpreta a Gwenda Halliday en la serie.
Geraldine Chaplin hace el papel de Mrs Fane.
Anthony Higgins interpreta a Count Ludwig Von Stainach en la serie.
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