David Mitchell John Taylor Actor Anna Maxwell Martin Lucy Betts-Taylor Actor Dipo Ola DI Russell Carter Actor Sophie Willan Holly Pinder Actor Gerran Howell DC Simon Evans Actor Izuka Hoyle DS Alice Finch Actor Dylan Hughes Henry Betts-Taylor Actor Ralph Ineson Chief Constable Ziegler Actor Dorothy Atkinson DCS Carol Shaw Actor Suzanne Ahmet Gillian Botley Actor Sophie Allen Ms Chordwell's Interpreter Actor Rose Ayling-Ellis Ms Freya Chordwell Actor Frankie Minchella Isaac Upton Actor Karl Pilkington DI Matt Neville Actor Pablo Raybould Barry Actor Sam Swainsbury Mr. Bishop Actor Jakub Bednarczyk Young John Actor Yasmin Dacre Sasha Sparks Actor Georgie Fallon Producer Kenton Allen Executive Producer Mark Brotherhood Executive Producer Saurabh Kakkar Executive Producer David Mitchell Executive Producer Kathryn O'Connor Executive Producer Chris Sussman Executive Producer Robbie McKillop Director