Kiran Sonia Sawar (Farah) & Anthony Welsh (Joe) also worked together on episode 4.3, Crocodile (2017) of Black Mirror (2011) as Shazia Akhand & Anan Akhand respectively.
Eleanor Fanyinka and Jing Lusi both previously starred in Holby City (1999), albeit in different seasons. Eleanor played Morven Digby and Jing played Tara Valentine.