LINE of Duty is all about police corruption, with AC-12 sniffing out as many bent coppers as it can.
In series six, one of those turned out to be DS Ian Buckles, and as the season draws to a close, here's more on what we know about him.
Who is Line of Duty’s 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.
Buckells and Devereux had been romantically involved so she was a willing witness but AC-12 soon saw through their ruse.
When Buckells was arrested, AC-12 also found an incriminating laptop hidden in his car, although he denied having any knowledge of how it got there.
Buckells was also the one who had undercover OCG member PC Ryan Pilkington (Gregory Piper) join MIU, who then went on to threaten DCI Jo Davidson.
When did Ian Buckells first appear in Line of Duty?
Buckells appeared in the first series of Line of Duty where he was appointed the SIO in the case of Jackie Laverty's disappearance.
This was the same series when fans were first introduced to Ryan, who supplied DCI Tony Gates with burner phones and tried to cut off Steve Arnott's fingers after he was kidnapped by the crime gang.
However, it was Buckells who decided not to take any further action against Ryan, allowing him to eventually go on to join the police force.
Buckells returned in series four when he was nominated to replace DCI Roz Huntley (Thandie Newton) on Operation Trapdoor after AC-12 tried to have her removed.
However, Kate Fleming was working undercover at the time and Buckells immediately recognised her.
Despite being asked to keep quiet, her real identity still reached Huntley, who used it to her advantage during her interview, however, Buckells claimed it wasn't him.
Could Ian Buckells be ‘H’?
Buckells is certainly in the running to be 'H' or 'the fourth man' despite appearing to be rather stupid earlier in the series before he was sent to prison.
Episode six saw Carmichael and Hastings investigate why Jo Davidson had been appointed to the Vella case, and it turned out Buckells had recommended her in a memo.
This is despite the fact he had never worked with her, however, he denied writing it, leaving the door open for forgery.
He was also seen with golf clubs and other golfing references in his office, which fans felt linked him to the other 'Caddies' in the series.
Could he be the the one they've all been looking for?
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