Nicholas Hoult Actor Joe Dempsie Actor Mike Bailey Actor Hannah Murray Actor April Pearson Actor Larissa Wilson Actor Dev Patel Actor Mitch Hewer Actor Kaya Scodelario Actor Daniel Kaluuya Actor Neil Morrissey Guest Star Danny Dyer Guest Star Robert Wilfort Guest Star Arabella Weir Guest Star Tom Payne Guest Star Siwan Morris Guest Star Naomi Allisstone Margeritte Ainsworth Guest Star Alan George Alan the Taxi Driver Guest Star Danielle Jadelyn Water Bottle Girl Guest Star Heidi Monsen Dr. Stock Guest Star Duncan Duff Congratulations Leader Guest Star Wendy Brierley Marnie Guest Star Stephen Walters Mad Twatter Guest Star Kevin Hudson Male Patient Guest Star Paul Gay Director Bryan Elsley Writer, Executive Producer Charles Pattinson Executive Producer George Faber Executive Producer