Peter Firth Harry Pearce Actor Hugh Simon Actor Nicola Walker Ruth Evershed Actor Rupert Penry-Jones Adam Carter Actor David Oyelowo Danny Hunter Actor Rory MacGregor Actor Shauna Macdonald Sam Buxton Actor Olga Sosnovska Fiona Carter Actor Nila Aalia Guest Star Owen Teale Guest Star Alrick Riley Director Rupert Walters Writer Simon Crawford-Collins Executive Producer Jane Featherstone Executive Producer Gareth Neame Executive Producer Julie Scott Executive Producer