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LINE Of Duty star Martin Compston has said Sunday's episode could be the last ever - but has promised fans a "perfect ending".

The 36-year-old actor, who plays DI Steve Arnott, said the cast haven't been told the drama will return.

Line of Duty's Martin Compston said the show has the 'perfect ending' for fans
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Line of Duty's Martin Compston said the show has the 'perfect ending' for fansCredit: Instagram

It came after the show's creator, Jed Mercurio, warned: "We’re in a situation where it’s not entirely clear that there will be a seventh series."

Martin told podcast : "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.

He said the cast of the hit BBC drama 'don't know' if there will be any more
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He said the cast of the hit BBC drama 'don't know' if there will be any more
Nearly 11million people tuned into Line Of Duty's penultimate episode on Sunday night
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Nearly 11million people tuned into Line Of Duty's penultimate episode on Sunday nightCredit: BBC

"We don't know [if there will be another series]. That's nothing new. Jed will only do it if there's a story to be told."

He added: "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."

A trailer was revealed ahead of the big finale on Sunday suggesting plots dating back years will be tied up.

All of series six's loose ends are set to be tied up in an explosive last episode
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All of series six's loose ends are set to be tied up in an explosive last episodeCredit: BBC
Could Ted or Steve find themselves in the firing line on Sunday night?
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Could Ted or Steve find themselves in the firing line on Sunday night?Credit: BBC

A caption on the screen declared: "Every investigation has led to this."

There is little doubt the BBC will be desperate for the show to return for a seventh series, after ratings reached 11million on Sunday.

That made it the most-watched TV show since Doctor Who’s Christmas Day special in 2008, which was seen by 11.7million.

Line of Duty drops trailer for explosive series 6 finale - with huge shoot-out as net closes in on H
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