I think it was called Polanski, late 80s think bbc but not sure.
The main character was an alcoholic and was some kind of Private investigator, it was set in London and south england. I remember it being entertaining ( but I was very young). It was in a similar vein to Dempsey & Makepeace.
I think it only lasted one series, and I can’t find anything on the web about it, searches mainly come up with details of a dodgy film director.