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