Peter Firth Harry Pearce Actor Hugh Simon Actor David Oyelowo Danny Hunter Actor Keeley Hawes Zoe Reynolds Actor Matthew Macfadyen Tom Quinn Actor Rory MacGregor Actor Jenny Agutter Tessa Phillips Actor Graeme Mearns Actor Esther Hall Actor Heather Cave Actor Lisa Faulkner Guest Star Debra Stephenson Guest Star Jasper Jacob Guest Star Bharat Nalluri Director David Wolstencroft Writer Stephen Garrett Executive Producer Gareth Neame Executive Producer