Hugh Grant Jeremy Thorpe Actor Ben Whishaw Norman Scott Actor Alex Jennings Peter Bessell Actor David Bamber Lord Arran Actor Jason Watkins Emlyn Hooson Actor Patricia Hodge Ursula Thorpe Actor Chris Ashby Messenger Actor Andrew French Sergeant-at-Arms Actor Nicholas Blane Norman van de Vater Actor Naomi Battrick Diana Stainton Actor Anthony O'Donnell Leo Abse Actor John Bett Lord Kilmuir Actor Susan Wooldridge Countess of Arran Actor Nick Malinowski Returning Officer Actor Morgan Watkins Mike Steele Actor Ben Moor BBC Radio Interviewer Actor Michelle Fox Lyn Actor Daryl McCormack Luck Mackenzie Actor Alice Orr-Ewing Caroline Allpass Actor John Preston Writer Stephen Frears Director, Executive Producer Russell T. Davies Writer, Executive Producer Dan Winch Producer Graham Broadbent Executive Producer Peter Czernin Executive Producer Diarmuid McKeown Executive Producer Dominic Treadwell-Collins Executive Producer Lucy Richer Executive Producer