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 Rory MacGregor Actor Shauna Macdonald Sam Buxton Actor Natasha Little Dr. Vicki Westbrook Actor Jenny Agutter Tessa Phillips Actor Bharat Nalluri Director David Wolstencroft Writer Jane Featherstone Executive Producer Gareth Neame Executive Producer Julie Scott Executive Producer