Guest Stars Tom Goodman-Hill as Tom Blice Lydia Wilson as Princess Susannah, Duchess of Beaumont Donald Sumpter as Julian Hereford Shazad Latif as Mehdi Raboud Jeany Spark as Camilla Nick Hendrix as Andrew Eleanor Wyld as Lydia Galway Jay Simpson as Rod Senseless Anna Wilson-Jones as Jane Callow Alex Macqueen as Special Agent Callett Rory Kinnear as Prime Minister Michael Callow Lindsay Duncan as Alex Cairns Allen Leech as Pike Patrick Kennedy as Section Chief Walker Alastair Mackenzie as Martin Johann Myers as Noel Chetna Pandya as Malaika Andrew Knott as Brian McKell David as Son Helen Fospero as Lucinda Towne Sophie Kennedy Clark as Lauren Rakie Ayola as Shelly Amit Shah as Jack Madeleine Bowyer as Sonia Aymen Hamdouchi as Kieran Sophie Wu as Jamie Jonathan Forbes as Browne Jeffry Wickham as Sir Harold Mount Julian Rivett as Damon Brown Wolf Wasserman as Spark Dominic Le Moignan as Nat Wallace-Dean Justin Edwards as Jon