Guest Stars Daniel Adegboyega as Pierre Martineau Keith McErlean as Albie Garston Adam Isla O'Brien as Ryan Henshall Barry John Kinsella as Michael Whithall Chris Newman as Remy Charlie Geany as Young Daniel age 12 Sophie Mensah as Cheryl Lee Cal O'Driscoll as Ollie Holly Sturton as Beatrice Garston Helen Norton as Mary Ann Bolt Darcey Campion as Harper age 13 Danielle Ryan as Ana Dao Ciara Kelly as Sarah age 13 Áine Hayden as Serafina Paul Elliott as Unit Commander