Line of Duty has been underpinned by one major question in recent series - who is the mysterious 'H', also known as The Fourth Man?No letter in the alphabet inspires quite as much intrigue as "H" for Line of Duty fans, who have been loyally watching season six in the hopes H's identity will be revealed.On Sunday evening's series six finale, fans got the answer they were looking for, as the identity of H - who has been working with the OCG from inside the police force - was revealed.Detective Superintendent Ian Buckells was exposed as H in nail-biting scenes, bringing an end to one of the biggest mysteries in television history.Chloe in cybercrime figured out he was responsible after tracing his spelling errors, realising Buckells always.
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