Guest Stars Paul Ready as Rob Macdonald Nicholas Gleaves as Roger Penhaligon Richard Riddell as Tom Fenton Anjli Mohindra as Nadia Ali Matt Stokoe as Luke Aikens Stephanie Hyam as Chanel Dyson Rosie Jones as Police Officer Michael Shaeffer as Richard Longcross Daniel Moore as SO15 Officer Sarah Malin as Nadia's Solicitor Julian Firth as Rob's Solicitor Kerri McLean as Surveillance Officer Tina Chiang as Surgical Administrator Michael Ryan as Gun Dealer David Carlyle as RASP Officer Ben Wright as Himself