Idris Elba John Luther Actor Warren Brown Justin Ripley Actor Dermot Crowley Martin Schenk Actor Michael Smiley Benny Silver Actor Nikki Amuka-Bird Erin Gray Actor Aimee-Ffion Edwards Jenny Jones Actor Kierston Wareing Caroline Jones Actor David Dawson Toby Kent Actor Alan Williams Frank Hodge Guest Star Steven Robertson Robert Millberry, Nicholas Millberry Guest Star Golda Rosheuvel Sally Thomas Guest Star Babou Ceesay Adewale Omotoso Guest Star James Puddephatt Steve Kimble Guest Star Hamza Jeetooa Depak Chandrapal Guest Star Sam Miller Director Neil Cross Writer