Mother of God! Ten questions on AC-12 and the hunt for bent coppers across all six series of Line of Duty. How many can you get right?
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▶ Play this quizJed Mercurio originally trained as a doctor and drew on his medical background to create his first TV drama, Cardiac Arrest, before turning to crime thrillers.
Adrian Dunbar is from Enniskillen in County Fermanagh, and his portrayal of Hastings turned catchphrases like 'Mother of God' into cultural moments.
AC-12 is the third anti-corruption unit established in the show's universe, following AC-3 and AC-9 — each with its own jurisdiction and history.
Keeley Hawes is also well known for playing MI5 officer Ros Myers in Spooks — her portrayal of DCI Denton divided audiences over whether she was hero or villain.
Belfast doubles for an unnamed English Midlands city in the show — sharp-eyed viewers occasionally spot Northern Irish street signs and landmarks.
Stephen Graham is renowned for his chameleon-like range, from playing Andrew 'Combo' Gascoigne in This Is England to Al Capone in Boardwalk Empire.
The reveal of Ian Buckells as 'H' in the Series 6 finale divided fans — many expected a more prominent character to be behind the shadowy criminal network.
Lennie James is widely recognised for playing Morgan Jones in The Walking Dead, a role he reprised across the original series and Fear the Walking Dead.
Thandiwe Newton brought her trademark intensity to the role, having previously won acclaim for performances in Crash and Westworld.
Arnott's refusal to cover up the wrongful killing during a counter-terrorism raid established him as a principled officer from the very first episode.
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