| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Agatha Christie | Crew | Writing | Original Film Writer, Creator | 3 |
 Blair Jollands | Crew | Sound | Sound Designer | 3 |
 Damien Timmer | Crew | Production | Executive Producer | 3 |
Gareth Bull | Crew | Sound | Sound Re-Recording Mixer | 3 |
 Hugh Laurie | Crew | Writing | Writer, Director, Screenplay, Executive Producer, Creator | 3 |
Humphrey Jaeger | Crew | Art | Production Design | 3 |
Ian Farr | Crew | Editing | Editor | 3 |
John de Borman | Crew | Camera | Director of Photography | 3 |
 Karen Lindsay-Stewart | Crew | Production | Casting | 3 |
Mika Orasmaa | Crew | Camera | Director of Photography | 3 |
 Harry Escott | Crew | Sound | Original Music Composer | 3 |
Laura Schalker | Crew | Costume & Make-Up | Makeup & Hair | 3 |
 Claire Jones | Crew | Production | Producer | 3 |
Emily Jacobs | Crew | Production | Casting | 3 |
Julie Davies | Crew | Costume & Make-Up | Makeup Supervisor | 3 |
Laura Smith | Crew | Costume & Make-Up | Costume Design | 3 |
Zak Melemendjian | Crew | Sound | Sound | 3 |
 James Prichard | Crew | Production | Executive Producer | 3 |
Basi Akpabio | Crew | Production | Executive Producer | 3 |
Jon Hollis | Crew | Visual Effects | Visual Effects | 3 |
Sarah Morton | Crew | Sound | Dialogue Editor | 3 |
Gina Cronk | Crew | Production | Executive Producer | 3 |
Helen Ziegler | Crew | Production | Executive Producer | 3 |
Benjamin Darier | Crew | Sound | ADR Mixer | 3 |
Belinda Cottrell | Crew | Editing | Editor | 3 |
Javier Delgado | Crew | Sound | Foley | 3 |
Fiona Chaffey | Crew | Costume & Make-Up | Makeup & Hair | 3 |
Rebecca Glover | Crew | Sound | Foley Editor | 3 |
Andrew Wood | Crew | Production | Co-Producer | 3 |
Elizabeth Jane Shepard | Crew | Art | Art Direction | 3 |
 Alistair Petrie | Cast | Actor | Rev Richard Jones | 3 |
Christian Patterson | Cast | Actor | Sergeant Ellis | 1 |
 Conleth Hill | Cast | Actor | Dr Alwyn Thomas | 3 |
 Emma Thompson | Cast | Actress | Lady Marcham | 1 |
Hugh Laurie | Cast | Actor | Dr. James Nicholson | 2 |
 Jim Broadbent | Cast | Actor | Lord Marcham | 1 |
 Maeve Dermody | Cast | Actress | Moira Nicholson | 3 |
 Martyn Ellis | Cast | Actor | Albert Gold Pro | 1 |
 Morwenna Banks | Cast | Actress | Amelia Cayman | 3 |
 Paul Whitehouse | Cast | Actor | Askew | 3 |
 Richard Dixon | Cast | Actor | Leo Cayman | 1 |
 Tim Treloar | Cast | Actor | Arthur Crowe | 1 |
 Trevor Cooper | Cast | Actor | Coroner | 1 |
 Amy Nuttall | Cast | Actress | Sylvia Bassington-ffrench | 3 |
 Leon Ockenden | Cast | Actor | Alex Pritchard | 1 |
 Miles Jupp | Cast | Actor | Henry Bassington-ffrench | 3 |
 Nicholas Asbury | Cast | Actor | Mr. Angel | 3 |
 Lucy Boynton | Cast | Actress | Frankie Derwent | 3 |
 Will Poulter | Cast | Actor | Bobby Jones | 3 |
 Daniel Ings | Cast | Actor | Roger Bassington-ffrench | 3 |
 Nicholas Banks | Cast | Actor | 'Thicko' Derwent-Broxley | 1 |
Bob Goody | Cast | Actor | Ted Miller | 1 |
 Patrick Barlow | Cast | Actor | Wilfred Bragge | 1 |
 Benedict Wolf | Cast | Actor | Hari Singh | 1 |
 Jonathan Jules | Cast | Ralph 'Knocker' Beadon | 3 | |
 Simon Markey | Cast | Actor | Nigel the Postman | 1 |
 Nia Trussler Jones | Cast | Actress | Mrs Gladys Roberts | 1 |
Samuel Farrer | Cast | Sammy | 1 | |
Tomos Farrer | Cast | Mickey | 1 | |
| Person | Type | Job | Role(s) | Episodes |
