- Patricia Hodge - Ursula Thorpe
- Naomi Battrick - Diana Stainton
- David Bamber - Lord Arran
- Susan Wooldridge - Countess of Arran
- John Bett - Lord Kilmuir
- Nicholas Blane - Norman Van De Vater
- Michelle Fox - Lyn
- Daryl McCormack - Luke Mackenzie
- Ben Moor - BBC Radio Interviewer
- Chris Ashby - Messenger
- Patrick Barlow - Capt Myers
- Michael Culkin - Reginald Maudling
- Peter F. Gardiner - David Steel
- Charlotte Lucas - Janet Lawrence
- Jasmyn Banks - Bridget
- Nigel Hastings - Stable Owner
- Pablo Raybould - Auctioneer
- Steffan Rhodri - DCS Michael Challes
- Adrian Scarborough - George Carman QC
- Chris Grahamson - Minehead Constable
- Paul Sloss - Stuart Kuttner
- Brett Allen - Anthony Johnson
- Joshua Richards - Manchester Policeman
- Nicola Goodchild - New Returning Officer
- Patrick Marber - Peter Taylor QC
- Fisayo Akinade - Clive Otunde
- Rhys Meredith - Gareth Williams
- Daniel Weyman - BBC TV Reporter
- Tim Chipping - Prison Guard
- Dannie Pye - Blonde man
- Anthony Kaye - Tall man
- Don Gallagher - MALCOLM KERR
- Robert Ryan - Political Supporter
- Tim Hudson - Ted Lethaby
- John Preston
- Graham Broadbent
- Lucy Richer
- Russell T Davies
- Dominic Treadwell-Collins
- Stephen Frears
- Peter Czernin
- Murray Gold
Hugh Grant interpreta a Jeremy Thorpe en la serie.
Ben Whishaw interpreta a Norman Scott en la serie.
Alex Jennings hace el papel de Peter Bessell.
Monica Dolan hace el papel de Marion Thorpe.
Jonathan Hyde interpreta a David Napley en la serie.
Jason Watkins hace el papel de Emlyn Hooson.
Patricia Hodge hace el papel de Ursula Thorpe.
Naomi Battrick interpreta a Diana Stainton en la serie.
David Bamber interpreta a Lord Arran en la serie.
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