*Spoiler warning for Line of Duty series six* Line of Duty fans have theorised that Ian Buckells is 'too thick' to be H and that another mole remains.
The sixth series finale of the BBC One crime drama appeared to confirm that the 'Fourth Man' and final corrupt police officer known as H was in fact the bumbling Detective Superintendent Ian Buckells (Nigel Boyle).
While the trio of Superintendent Ted Hastings ( Adrian Dunba r), DI Kate Fleming ( Vicky McClure ), and DI Steve Arnott ( Martin Compston ) managed to bring down the corrupt officer at the heart of the mystery surrounding the murder of journalist Gail Vella, the Organised Crime Group remains active - but are there more moles within the police to be exposed?
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