Peter Firth Harry Pearce Actor Hugh Simon Actor Nicola Walker Ruth Evershed Actor David Oyelowo Danny Hunter Actor Keeley Hawes Zoe Reynolds Actor Matthew Macfadyen Tom Quinn Actor Shauna Macdonald Sam Buxton Actor Megan Dodds Actor Samantha Coughlan Guest Star Bruce Payne Guest Star Sam Miller Director Howard Brenton Writer Jane Featherstone Executive Producer Gareth Neame Executive Producer Julie Scott Executive Producer