Line of Duty – all the unanswered questions after Season 5’s epic finale

Gripping police drama Line of Duty reached a dramatic finale tonight but left fans scratching their heads.

Viewers hoping to discover the ­identity of corrupt copper and organised crime boss “H” were disappointed. And they will have to wait for answers as creator Jed Mercurio is yet to start series six.

Here are some of the mysteries Line of Duty’s millions of fans would like to see being solved.

Who really is H?

Clues pointed to Supt Ted Hastings being H but he had been framed by police legal counsel, Gill Biggeloe. In tonight’s final scenes, DS Steve Arnott and DI Kate Fleming discovered H was actually a Morse Code clue.

Corrupt dying DI Matthew “Dot” Cottan, codenamed The Caddy, tapped H in Morse as he couldn’t speak. His clue was actually dot dot dot dot – signifying four bent coppers.

They are Dot Cottan, ACC Derek Hilton and now Gill Biggeloe, plus one more.

Who ordered Sgt Tina Tranter to assassinate Biggeloe to stop her talking? Could it be Rohan Sindhwani, the new Police and Crime Commissioner? He was very close to Biggeloe and looked shifty as he stood with DCC Andrea Wise discussing the success of Operation Peartree at the end of the episode.

How did DS Arnott notice the hand signal?

Few would doubt Arnott’s abilities as a police officer but seeing a moving hand on a still image is going beyond even his skills.

He apparently realised Dot was using his hand to sign out Morse despite the video being paused.

He told Hastings: “We’ve been re-examining Dot’s dying declaration. The frame it was frozen on during your interview made me spot something we’ve all missed. Look at Dot’s left hand.”

Why was Biggeloe given immunity from prosecution without divulging who the fourth member of the gang is?

Biggeloe was revealed as corrupt, having used her power and influence to pick DS John Corbett specifically for the undercover job on Operation Peartree.

She set Corbett on a false mission to unmask Hastings as H.

She led Corbett to think the superintendent was responsible for the murder of his mum in Belfast.

Biggeloe also stole Hasting’s DNA, via his hairbrush when they spent a night together, to plant on Corbett’s body to frame him for murder.

As Biggeloe was cuffed, DI Fleming said she would want to do a deal as she is “too fond of the finer things to do a prison stretch”. And she was right. As a reward for “assisting with subsequent prosecutions” she was shown abandoning her car and starting a new life but why was she given immunity without divulging the fourth member?

Earlier in the episode, she told Patricia Carmichael: “We all know confessing to conspiracy to murder will make me ineligible for immunity from prosecution. Have you not been listening love, there’s no such thing. I’m just one rotten apple.”

Perhaps she maintained her argument that she was acting alone. It also was not explained what happened to Tranter, shot by Arnott for trying to stab Biggeloe.

She was shown being taken to hospital. Why didn’t she reveal who gave her the order to murder Biggeloe?

Is Ted Hastings corrupt?

Biggeloe had tried to frame Hasting but the question remains could he be corrupt?

They never uncovered exactly what he told Organised Crime Group member Lee Banks when he visited him at Blackthorn Prison. Lisa McQueen claims it was Lee that revealed Corbett was a rat. Did Hastings blow his cover? Hastings was inconsolable after discovering Corbett was the son of Anne-Marie McGillis.

He even needed to take a break from the interview to compose himself. So perhaps his reaction was guilt knowing he had been responsible his friend’s son’s death.

Mark Moffatt confessed to being bribed and he said there was £100k to plant on Hastings but only £50K was discovered.

Hastings walked toward’s Corbett’s grave, where his widow was grieving for him. Did he give the dodgy cash to her?

Why did Hastings wipe his computer?

During this series, Hastings was spotted numerous times behaving suspiciously around his laptop.

The OCG communicated with H via instant messages on a laptop.

In episode two an instant message pinged on his open laptop while he studied his divorce papers in the hotel room. In episode three, Hastings was seen wrapping his laptop in bubble wrap and taking it to an electronic disposal centre.

Prudish Catholic Hastings claimed that he wiped the computer – not because of corrupt activity – but because he had been watching porn on it, adding: “Nothing illegal, nothing extreme. I just did not want it to be found. That’s all. It was private. My wife has left me.” But is that really the case?

Were the computer messages read by McQueen being sent by the mysterious fourth member?

Someone was communicating with Lisa and Corbett and the rest of the Organised Crime Gang via instant messenger.

It was presumed it was H sending the messages before AC-12 and
Hastings started impersonating them.

If it wasn’t H, who was it?

It seems like Biggeloe wouldn’t have been sending them either, so who was it? Could it have been the mysterious fourth Caddy?

And why have they never learnt how to spell “Definately” correctly?

Does Arnott have a painkiller addiction?

Through earlier series, Arnott has been famous for his womanising but he’s had very little action in series five.

He was spotted swiping through dating apps while taking a painkiller in episode one.

He was hiding in the bathroom clutching his back after failing to perform with former flame Sam Railston. Steve is still recovering from being injured in the series four attack that left him temporarily wheelchair-bound and has been spotted popping painkillers throughout the series. Has he become addicted to them?

Is the OCG really finished?

In return for witness protection, McQueen disclosed information on organised criminal activities and personnel. Under an alias, she now educates teenagers to avoid crime.

But could she really turn her back on a life of crime.

She must know that witness protection will not keep her safe: look what happened to Tommy Hunter.

And she lied in her interview with the police, claiming that deceased Miroslav Minkowicz had killed Corbett when in fact it was Ryan Pilkington who delivered the fatal blow.

She also claimed that the OCG was finished because there were no members left.

Pilkington joined the police academy at the end of the episode.

He has been involved in organised crime since childhood and was spotted delivering burner phones in series one. It is unlikely he has gone straight.

He also mentioned PC Simon Bannerjee as his inspiration for joining the police force. Bannerjee has not been seen since the first series. Could he also be corrupt?

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