Mark Bonnar (Colin Osborne) & Douglas Hodge (Paul Nixon) also worked together on four episodes of Catastrophe (2015) together, as Chris & Douglas respectively.
Holly Aird (Elise) & Nigel Lindsay (Tom Kelsey) also worked together on Dressing for Breakfast (1995) as Carla & Dave respectively.
Nicola Walker (DCI Cassie Stuart) and Adeel Akhtar (Hassan Mahmoud) previously starred together in River (2015), as Jackie 'Stevie' Stevenson & Ira King 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) & Tim Faraday (Gerry Samuels) also worked together on episode 7.5 Waking the Dead (2000), of Waking the Dead (2000) as Dr. Frankie Wharton & Tom respectively.