Peter Firth Harry Pearce Actor Nicola Walker Ruth Evershed Actor David Oyelowo Danny Hunter Actor Keeley Hawes Zoe Reynolds Actor Matthew Macfadyen Tom Quinn Actor Jenny Agutter Tessa Phillips Actor Shauna Macdonald Sam Buxton Actor Megan Dodds Actor Sophie Lombard Guest Star Daniel Cerqueira Guest Star Sam Miller Director Ben Richards Writer Jane Featherstone Executive Producer Gareth Neame Executive Producer Julie Scott Executive Producer