Guest Stars Christopher Cowlin as Police Officer Owen McDonnell as Ryan Kelvin Haydn Gwynne as Helen Ferguson Clare Calbraith as Lizzie Kennedy Daisy Ridley as Hannah Kennedy Ashley Walters as DI Carter Liam Garrigan as Dr. Christy Nash Gary Pillai as Stephen Miskin Jamie Parker as Ben Morgan Daisy Waterstone as Katie Bowman Kirsty Besterman as Amy Nash Peter Vollebregt as Mark Janssen Teresa Churcher as Gemma Bowman Julie Hoult as Carol Clare Wille as Phoebe Gilchrist