Line of Duty: Everything we learnt from Buckells' AC-12 interview as he's uncovered as H As it normally does - Line of Duty provided us with one last major twist in its season finale Updated The video will auto-play soon8Cancel Play now Never miss a thing from Belfast and beyond - sign up for FREE newsletter direct to your inboxInvalid EmailSomething went wrong, please try again later. Subscribe When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice