Line of Duty fans were left doing a double-take on Sunday evening, as H’s identity was finally revealed in history-making scenes.Detective Superintendent Ian Buckells has been unmasked as The Fourth Man, who has been working alongside the OCG while inside the police force.Watching the big reveal go down at home, viewers took to Twitter to express their shock, with many left feeling blindsided by H's reveal.However, there have been a number of clues dropped over the years pointing to Buckells, played by Nigel Boyle, as the mysterious crooked copper.Below are the biggest clues that have featured over the years, hinting Buckells is the baddie we have been looking for.DSI Buckells returned to Line of Duty in season six when he was appointed the.
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