Lucy Boynton Ruth Ellis Actor Toby Jones John Bickford Actor Adam Lawrence DI Peter Gill Actor Ed Sayer Anthony Findlater Actor Pierre Bergman Reporter Actor Tim Potter Albert Pierrepoint Actor Annie Miles Mrs Winstanley Actor Advait Kottary Jayveer Sethia Actor Israr Azam Cooch Behar Actor Darren Charman Foreman Actor Nigel Havers Judge Havers Actor Toby Stephens Melford Stevenson QC Actor Laurie Davidson David Blakely Actor Mark Stanley Desmond Cussen Actor Joe Armstrong DCI Davies Actor Arthur Darvill Victor Mishcon Actor Juliet Stevenson Dr. Charity Taylor Actor Kate Bartlett Executive Producer Angie Daniell Producer David Fisher Film Editor Lee Haven Jones Director Kelly Jones Screenwriter Antonia Gordon Executive Producer