Nicola Walker (DCI Cassie Stuart), Adeel Akhtar (Hassan Mahmoud) and Josef Altin (Tyler) previously starred together in River (2015), as Jackie 'Stevie' Stevenson, Ira King and Christopher Riley respectively.
Mark Bonnar (Colin Osborne) & Douglas Hodge (Paul Nixon) also worked together on four episodes of Catastrophe (2015) together, as Chris & Douglas respectively.
Mark Bonnar (Colin Osborne) & Jordan Long (DS Murray Boulting) also worked together on New Blood (2016) as Peter Mayhew & Jerry Clarke respectively.
Holly Aird (Elise) & Nigel Lindsay (Tom Kelsey) also worked together on Dressing for Breakfast (1995) as Carla & Dave respectively.
Adeel Akhtar (Hassan Mahmoud) & Douglas Hodge (Paul Nixon) also worked together on The Night Manager (2016) as Rob Singhal & Rex Mayhew respectively.