Line of Duty’s Martin Compston hints at ‘perfect ending’ as he admits series six finale could be last ever episode

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Martin Compston has crushed fans by claiming Sunday's Line of Duty season finale could be the last ever episode.

The hit BBC crime drama has been running for nine years, and has so far produced six seasons, gripping viewers as they try to work out who 'the fourth man' making up a corrupt group of police officers titled 'H' could be.

But Martin, 36, who plays Detective Inspector Steve Arnott on the hit show, has hinted it may not return for a seventh season.

He claims the cast, which includes Adrian Dunbar and Vicky McClure, are yet to be told if they will be back on screens together.

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Speaking on the podcast Shrine of Duty, Martin said: "It's different elements this year, because we have to look it in terms of, do people want us back? You don't want to overdo it.

"Ten years in you start to think of legacy, and if it goes down that well it might be the perfect ending.

"But then we might go another couple of months and… what I will say is we won't do one just for the sake of doing it."

When asked if there will be another series, Martin admitted show creator Jed Mercurio still hadn't let them know.

He said: "We don't know. That's nothing new. Jed will only do it if there's a story to be told. Jed always takes time after a series, like a couple of months.

"There's a lot of stuff above my pay grade like analytics and audience scores. He takes the emotion out of it and looks at all that."

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Series six has seen Martin's character Steve Arnott, Kate Flemming (Vicky McClure) and Ted Hastings (Adrian Dunbar) draw ever closer to the end of the agonising search for 'H' – the mysterious police officer who AC-12 are convinced has been conspiring with the organised crime group, also known as OCG.

As the final episode of the series nears the BBC have shared a trailer of the dramatic finale of the popular police series.

The clips sees a montage showing the van crash which saw the death of an AC-12 armed officer and newspaper clippings of murdered journalist Gail Vella as Superintendent Hastings says: "All of these suspicious deaths were orchestrated by one officer in particular."

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Ted then continues: "H. The fourth man." The video then cuts to other potential suspects including DCS Patricia Carmichael, Chief Constable Philip Osborne and DCI Marcus Thurwell, who fans are convinced are still alive and he faked his own death, and even shows Kate.

The words: "Every investigation has led to this… H," while more dramatic clips shows DI Arnott and AC-12 officers dressed in armed gear while close ups show large guns are drawn.

The series six finale of Line of Duty will air on Sunday at 9pm on BBC One.

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