Guest Stars Naomi Battrick as Diana Stainton Morgan Watkins as Mike Steele Alice Orr-Ewing as Caroline Allpass Andrew French as Sergeant-at-arms Nick Malinowski as Returning Officer Daryl McCormack as Luke Mackenzie Nicholas Blane as Norman Van de Water Susan Wooldridge as Countess of Arran Anthony O'Donnell as Leo Abse Ben Moor as BBC Radio Interviewer Michelle Fox as Lyn John Bett as Lord Kilmuir Chris Ashby as Messenger