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**WARNING - major Line of Duty spoilers below!**
Line Of Duty drew to a close on Sunday night, and after nearly 10 years of searching, AC-12 finally uncovered H.
With a whole raft of fan theories, clues and red herrings, Line of Duty writer Jed Mercurio revealed that it was actually the bungling Ian Buckells (Nigel Boyle) who was the main link between the police force and the OCG.
He was at long last caught out when Chloe Bishop (Shalom Brune-Franklin) pinpointed the now infamous misspelling, 'definately', peppered throughout the numerous reports he had written.
But the reveal was hugely disappointing to some fans, who was expecting a more looming figure as H instead of one of the most useless officers in the police force.
However, some fans have deduced that Line of Duty's big 'reveal' was fake all along - and pointed back towards a scene earlier this series.
After Jimmy Lakewell (Patrick Baladi) gave AC-12 a huge clue, H is thought to have ordered him to have been killed, with the former lawyer being strangled in prison in front of Buckells.
But eagle-eyed armchair detectives, who have since rewatched the scene, queried why Buckells was physically shaking before Lakewell was executed - especially as he would have been the one that carried out that order.
Because of this, some deduced that Buckells was just a cover, with Chief Constable Phillip Osborne (Owen Teale) really running the show as H - and there must be another season on its way to get AC-12 to finally nail him.
"H is definitely Chief Constable Phillip Osbourne, Ian Buckells did his bidding," deduced one fan on Twitter. "Ian was in bits before Jimmy Lakewell's murder."
"Why was Ian Buckells quaking in his boots when Jimmy Lakewell was killed, if he was running the show?" a second chipped in.
"I may be being hopeful but Buckells is a red herring and is not H," said a third. "Why would Ian Buckells as H have Jimmy Lakewell killed in front of himself to remind himself what happens to rats?"
Others pointed towards Ted Hastings's confession over his part in John Corbett's (Steven Graham) murder, and the end credits where it is revealed Buckells was fighting for immunity from prosecution, are also factors that suggest a season seven is on the cards.
While writer Jed Mercurio and the rest of the Line of Duty cast have been tight-lipped about the future of the series, BBC Chief Content Officer, Charlotte Moore, has given an update about Line of Duty's future.
"Addictive event television, Line of Duty has kept the nation guessing for the last seven weeks, so it's no surprise that last night's jaw-dropping finale set a ratings record," she said in a statement.
"Jed Mercurio is a master of his craft, and I would like to congratulate him and the entire cast and crew for delivering such an incredible drama series.
"I'm looking forward to having a conversation with the team about where we go next, and what the future of the series might be."
For now, Line of Duty is available to watch on BBC iPlayer.
Featured Image Credit: BBC
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