Guest Stars Colin R. Campbell as Detective Superintendent Andrews Adeel Akhtar as Hassan Mahmoud Rosie Cavaliero as Marion Kelsey Mark Bonnar as Colin Osborne Nigel Lindsay as Tony Kelsey Lorraine Ashbourne as DI Tessa Nixon Badria Timimi as Sara Mahmoud Charlie Condou as Simon Aasiya Shah as Gemma Khan Will Brown as Jason Walker 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