Guest Stars Colin R. Campbell as Detective Superintendent Andrews Adeel Akhtar as Hassan Mahmoud Mark Bonnar as Colin Osborne Lorraine Ashbourne as DI Tessa Nixon Nigel Lindsay as Tony Kelsey Charlie Condou as Simon Rosie Cavaliero as Marion Kelsey Badria Timimi as Sara Mahmoud Will Brown as Jason Walker Aasiya Shah as Gemma Khan Amy Jayne as Flo Emma Cunniffe as Janet Bryony Hannah as Cath Nathalie Armin as DSI Kuldip Gill Wendy Craig as Joy Dunphy Holly Aird as Elise Bill Paterson as Harry Osborne Tom Mannion as Mark Roberts