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Line of Duty returns with a brand new six-part series on BBC One that will see AC-12 working together to uncover the truth and tackle their most devious opponent yet – DCI Roz Huntley (played by Thandie Newton).

The gripping show is returning with the tagline: "Who polices the police?"

Promising to uncover police corruption, the characters tease: "Huntley's definitely hiding something," and: "I'm not corrupt."

Another officer can be heard saying: "I'm only interested in one thing, and that's bent coppers."