Gallery: See what the cast of Line of Duty looked like at the start of their careers (Hello!)"In series six and beyond there are some nice surprises to come. "The cast members returning for season six include Cillian Murphy, who plays Tommy Shelby.
Paul Anderson will also be back as Arthur Shelby, Tommy's brother, and Helen McCrory back as Aunt Polly. He added: "Music has always been part of it and the music will continues to attract stellar artists. "Over the course of the show's run, its scenes have been soundtracked by the likes of Nick Cave and the Bad Seeds, and Mercury Prize nominated artists like Anna Calvi, Laura Marling and Arctic Monkeys.
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