Billie Piper Mandy Director, Actor, Screenwriter, Executive Producer David Thewlis Vic Actor Lily James Cressida Actor Leo Bill Pete Actor Kerry Fox Marion Actor Toby Woolf Larch Actor Antonia Campbell-Hughes Cathy Actor Trevor White Leonardo Actor Jonjo O'Neill Dougie Actor Montserrat Lombard Val Actor Emily Taaffe Becky Actor Mariah Gale Vanessa Actor Rosa Coduri Meredith Actor Vaughan Sivell Producer, Executive Producer Franki Goodwin Executive Producer Mike Rattenbury Executive Producer Will Kane Executive Producer Eloise Singer Executive Producer Luke Dundas Executive Producer Josh Varney Executive Producer Ben Pugh Executive Producer Paul Higgins Executive Producer Jim Reeve Executive Producer Robert A. Halmi Executive Producer Jeff K. Clarke Executive Producer Claire Lee Executive Producer Stephen Wallace Executive Producer Keith Potter Executive Producer Patrick Meller Cinematographer Hazel Baillie Film Editor Nathan Coen Original Music Sarah Kane Production Design Louise Corcoran Art Director Grace Snell Costume Design Shaheen Baig Casting