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 Raza Jaffrey Zafar Younis Actor Adrian Lukis Guest Star Arabella Weir Guest Star Vincenzo Nicoli Guest Star Tim McInnerny Guest Star Bill Anderson Director Howard Brenton Writer Simon Crawford-Collins Executive Producer Jane Featherstone Executive Producer Gareth Neame Executive Producer Julie Scott Executive Producer