LINE of Duty fans are convinced Dot Cottan exposed the fourth member of H in a game-changing clue before his death. The character was revealed to be a bent copper in the series three finale, and as he lay dying, he managed to blink out a clue to another corrupt officer called 'H' to Kate Fleming.
His clue has lead Kate, Steve Arnott and Ted Hastings on the hunt for H ever since, with the initial belief being it was the initial of the cop working with the OCG.
However, the AC-12 trio then realised Dot tapped his fingers four times, leading them to think they should be looking for a 'fourth man' in addition to Dot, Derek Hilton and Gill Biggeloe.
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