Idris Elba Luther Actor Dermot Crowley Martin Schenk Actor Warren Brown Justin Ripley Actor Michael Smiley Benny Silver Actor Nikki Amuka-Bird Erin Gray Actor Aimee-Ffion Edwards Jenny Jones Actor David Dawson Toby Kent Actor Kierston Wareing Caroline Jones Actor Pam Ferris Baba Actor Steven Robertson Robert Millberry, Nicholas Millberry Guest Star J. August Richards Richard Gardiner Guest Star Alan Williams Frank Hodge Guest Star Ellie Haddington Linda Carroway Guest Star Stephen Boxer Joe Shepherd Guest Star Sam Miller Director Neil Cross Writer