Peter Firth Harry Pearce Actor Hugh Simon Actor David Oyelowo Danny Hunter Actor Keeley Hawes Zoe Reynolds Actor Matthew Macfadyen Tom Quinn Actor Rory MacGregor Actor Jenny Agutter Tessa Phillips Actor Graeme Mearns Actor Esther Hall Actor Heather Cave Actor Christopher Fulford Guest Star Karzan Krekar Guest Star Rob Bailey Director Simon Mirren Writer Stephen Garrett Executive Producer Gareth Neame Executive Producer