Jim Broadbent as Lord Longford

Lindsay Duncan as Lady Elizabeth Longford

Samantha Morton as Myra Hindley

Andy Serkis as Ian Brady

Kate Miles as Rachel Pakenham

Alex Blake as Paddy Packenham

Sarah Crowden as Lady Tree

Robert Pugh as Harold Wilson

Anton Rodgers as Willie Whitelaw

Kika Markham as Governor Wing

Tam Dean Burn as Roy

Lee Boardman as Talk Show Host

Caroline Clegg as Longford's Secretary

Roy Barber as Father Kahle

Karen Spragg as Patricia Cairns

Karen Bayley as Holloway Prison Officer

Ian Connaughton as Journalist

David MacCreedy as Journalist

Richard Sinnott as Journalist

Charlotte West-Oram as Downing Street Secretary

Gordon Langford Rowe as Judge

Ron Meadows as Defence Barrister

Tina Malone as Elsie

Martina McClements as Home Office Secretary

C.P. Hallam as Fred Harrison

Pamela Cheshire as Cookham Wood Prisoner

Daniel Maley as Schoolboy

Ross Tomlinson as Schoolboy