I think this might've been more a CITV comedy rather than a grown-ups comedy, but a sort of Mr Bean-esque sitcom from around late 80s/early 90s called Bradley, starring Paul Bradley. There's barely anything I can find out about it online - certainly no clips - and the only memory I have of it is from a scene of its recurring gimmick where the main character, Bradley, talks to himself in a full length dress mirror, with his reflection talking back to him in a two-way conversation.
I can't even remember what's said. All I can remember is the setting, which from memory was an almost completely dark set, with the only things being lit were the main character and the mirror which talks back to him.