Karl Golden Director Zawe Ashton Sarah Actor Jack O'Connell Dylan Actor Henry Lloyd-Hughes Matt Actor Emily Barclay Claire Actor Dean Andrews Sargent Thompson Actor Stephen Wight Gary Mac Actor Sam Hazeldine Maurice Actor Richard Riddell Craig Actor Ben Batt John Anderson Actor Perry Fitzpatrick Chris Actor Ian Brady Producer Stephen Salter Producer Robert Walak Producer Chris Coghill Screenwriter David Hayman Executive Producer Mark Jaffray Executive Producer Ken McMahon Executive Producer David Kenyon Thomas Executive Producer James Edward Barker Original Music John Conroy Cinematographer Martin Brinkler Film Editing Elaine Grainger Casting Kristian Milsted Production Design Byron Broadbent Art Director Camille Benda Costume Design