A recurrent song throughout this series is "I Love To Love (But My Baby Loves To Dance)," by British disco artist Tina Charles (circa 1976).
Greater London Police is fictional and is likely used to avoid licensing disagreements with the real life Metropolitan Police Service.
Nicola Walker (Jackie 'Stevie' Stevenson), Adeel Akhtar (Ira King) and Josef Altin (Christopher Riley) also worked together in Unforgotten (2015), as DCI Cassie Stuart, Hassan Mahmoud and Tyler respectively.
Actors Owen Teale and Josef Altin are both Game of Thrones (2011) alums; they played Alliser Thorne and Pypar, respectively.
River (2015) is a six-part British television drama series, created and written by Abi Morgan and starring Stellan Skarsgård and Nicola Walker. It premiered on BBC One on October 13, 2015 and internationally on Netflix on November 18, 2015. The series is a police procedural.