Fans have been asking since the announcement that Line of Duty is returning: who is the real H? World Production // BBCRelated: Line of Duty star Martin Compston's "terrific" Glasgow-set crime drama is now streaming for free"It's always a weird sort of place to be because you're all knackered, you know," she said. I mean, look, Martin and Adrian are two of my closest friends. BBC/World ProductionsRelated: Adrian Dunbar confirms filming for Line of Duty series 7 was recently pausedAnd she joked: "I've actually changed my hair already just in fear of pick-ups." Visit our Streaming Guide now to see at a glance where you can view ALL your favourite shows and movies.