Line of Duty fans 'work out' H's real identity already exposed years ago in Dot scene Line of Duty viewers have been speculating that the identity of the final H could have been revealed by Dot Cottan in his dying declaration years ago in a huge new theory Updated The video will auto-play soon8Cancel Play now Daily Star's Inside Hot TV newsletter sees Ed Gleave send you telly's hot takes straight to your inbox every SundayInvalid EmailSomething went wrong, please try again later. Yes, keep me in the know! 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.