Went to the dentist. Irksomely, the 'on-lay' has turned into a root canal and crown (starting John Thaw as old style cop Harry Root-Canal and Haydn Gwynne as new-style, university educated police-woman Alex Crown). I guessed this was happening as he drilled more and more and I felt it on the nerve - I think you get more anesthetic for a root-canal proper. He sat me up and said it needed a root canal and crown or to come out. Deep joy.