Line of Duty blunder has revealed a famous new cast member for season six - with the BBC launching an urgent probe, according to reports.A top actor will be joining the likes of Vicky McClure, Martin Compston and Adrian Dunbar for Sunday's episode, the fifth of the season's six-episode run.The Sun reports that the blunder was made by BBC Maestro, a service which sells online writing courses in close collaboration with the Beeb's commercial arm, BBC Studios.The publication chose not to name the celebrity so the episode isn't spoiled for fans.It reports that the actor's face could be seen on a database being browsed by Martin's Detective Inspector Steve Arnott, and that a scene starring the actor was later accidentally shown.After each.
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