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DSI Marcus Thurwell (James Nesbitt) is reportedly Ladbrokes favourite to be unveiled as the antagonist with odds of just 7/4, with viewers convinced that the bent copper is still alive despite being declared dead by Spanish officers in the last episode.
Meanwhile, DCI Patricia Carmichael (Anna Maxwell Martin) has odds of being the villain of 2/1 according to Betfred.
Caught at last? By the look of determination on their faces, Kate and Steve look set to finally put an end to the mystery that has eluded them for months - but viewers will have to wait and see whether they do have H in their sights
People across Britain are gearing up for the BBC s Line of Duty series finale tonight, with 12million viewers expected to tune in.
The show sees the officers of police anti-corruption unit AC-12 pitted against the mysterious antagonist known only as H or the fourth man , who heads up an organised crime syndicate controlling events from the shadows and potentially from within AC-12 itself.
The series has gone from strength to strength since its release, growing from an initial audience of four million adults to more than 11million tuning in for the current series penultimate episode.
Earlier this week, the BBC released a teaser trailer promising an action-packed finale complete with a police standoff, the return of balaclava men and the discovery of a written note with THAT definately misspelling.
Line Of Duty stars Vicky McClure and Martin Compston have shared moving tributes to the show s die-hard fans as they count down the hours until the long-awaited series six finale.
The actress, who has played DI Kate Fleming since the show s inception in 2012, continued to fuel fans concerns that the series could be coming to an end in a lengthy Twitter post, which ended with the phrase: Let s wrap this up!
Meanwhile Martin, known to many as DI Steve Arnott, described working on the series as the job of a lifetime and vowed that fans will finally get answers after months of theorising over the identity of the elusive H.
Updated: 2 May 2021, 22:52
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THE final episode of Line of Duty s season six finally sees bungling bent copper Det Supt Ian Buckells revealed as arch villain H.
It s something that continued to intrigue audiences as detective unit AC-12 pursued their hunt for the corrupt police officer at the heart of the BBC crime drama.
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Who is Ian Buckells?
Detective Superintendent Ian Buckells is played by actor Nigel Boyle and was assigned to Hillside Lane Station Murder Investigation Team.
During series six, Buckells coaxed a false testimony out of Deborah Devereux to link Terry Boyle to the murder of journalist Gail Vella.
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While another added: Okay who else is ready for this? #Line of Duty.
Another Line of Duty fan wrote: Imagine being the actor who plays H waking up tomorrow to your face on the front of every tabloid newspaper in the UK.
Elsewhere actor Sanjeev Bhaskar wrote: So final episode of this series of Line of Duty in just over an hour so I ll say in advance.that s exactly what I thought was going to happen.
Prior to tonight s show, fans shared their excitement and began to speculate who H could be
Detective Steve Arnott finally speaks with a doctors from Occupational Health after putting off a drugs test