Guest Stars Geraldine James as Julie Wells Hannah Arterton as DC Ally Caine Michael Maloney as Alan Wells Don Warrington as Ray Kenwood Sophia La Porta as Britnay Shearer Lauren Douglin as Izzy Allan Kim Allen as Jane Shilling Aedan Duckworth as Young Mark Saoirse-Monica Jackson as Sasha Lara Bradban as Blonde Dylan Jupp as Simon Marshall Leon Ward as Andy Megan Bradley as Young Pru Niall Greig Fulton as Richard Payne Charles De'Ath as Dominic Porter Alexa Davies as Alexa Sophie Simnett as Blonde Student Cherrelle Skeete as Clare Seeta Indrani as Dr. Khan Lola Mae Loughran as Chrissie James Boyland as DS Cal Brown Leah Haile as Cocky Student Alex Okoampa as Rashan Shaheen Khan as Mrs. Palmer Heather Phoenix as Psychologist Kirsty Sawyer as Chloe Debra Baker as Mrs. Mills Yemisi Oyinloye as Desk Sergeant Helen Barford as Police Officer Paul Ryan as Mr. Mills