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