Guest Stars Tom Chadbon as Henry Williams Julia St. John as Sarah Evans Joe McFadden as Alistair Josette Simon as Frances Lively Nasser Memarzia as Amir Haron Pooja Ghai as Tasmeen Haron Toyah Willcox as Hazel Tillier Callum Dixon as Billy Napier Sophie Bleasdale as Chantelle Tillier Kate Foster-Barnes as Mandy Horfield Ryan Early as Anthony Horfield Paul Reynolds as Kev Crowley Uncredited Emma Holmes as Patient