Line of Duty will return to BBC1 next year for a much-anticipated seventh series - five years after 17 million viewers watched the 2021 finale to discover the identity of H. Starring Adrian Dunbar , Vicky McClure and Martin Compston as much-loved Ted Hastings, Kate Fleming and Steve Arnott, the hit cop drama tells the story of fictional police anti-corruption unit AC-12, which investigates bent coppers. In the new series the unit has been ditched and rebranded as the Inspectorate of Police