Peter Firth Harry Pearce Actor Hugh Simon Actor Nicola Walker Ruth Evershed Actor Rupert Penry-Jones Adam Carter Actor David Oyelowo Danny Hunter Actor Keeley Hawes Zoe Reynolds Actor Matthew Macfadyen Tom Quinn Actor Rory MacGregor Actor Shauna Macdonald Sam Buxton Actor Olga Sosnovska Fiona Carter Actor Nila Aalia Guest Star Richard Harrington Actor Harriet Walter Guest Star Barnaby Kay Guest Star Raza Jaffrey Zafar Younis Actor Tim McInnerny Guest Star Adrian Lukis Guest Star Adrian Rawlins Guest Star Paul Jesson Guest Star James Dicker Guest Star Bill Anderson Director Jonny Campbell Director Justin Chadwick Director Rupert Walters Writer Alrick Riley Director Cilla Ware Director Ben Richards Writer Howard Brenton Writer David Wolstencroft Writer Raymond Khoury Writer Simon Crawford-Collins Executive Producer Jane Featherstone Executive Producer Gareth Neame Executive Producer Julie Scott Executive Producer