** WARNING: SPOILERS BELOW **Line of Duty fans want to know one answer – who is the mysterious H?Avid viewers of the hit BBC anti-corruption police drama have been waiting patiently until series six to discover the identity of the top dog police officer embroiled in organised crime.And some eagled-eye armchair detectives believe they have sussed out who the super-villain really is.DI Dot Cottan revealed the significance of the letter 'H' in his dying declaration during the explosive series three finale, which then led AC-12 to establish three of the four high ranking members of the police working in organised crime.The bent villains that have already been exposed are Dot as The Caddy, ACC Derek Hilton and Senior Legal Counsel Gill Biggeloe,.
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