I stumbled across it on the Internet some time ago and can’t remember the name. It looked to me like it was Thatcher-era, i.e., early '80s, around the same time as Dempsey and Makepeace. Almost certainly an ITV production. I think it was set in Northwest England, maybe Manchester. Very “gritty,” crime-wise. In the one episode I watched, a lot of the action took place on board a canal boat; whether that was a standing set (where the protagonist lived and/or worked), I don’t remember. He was, I think, maybe a retired cop—an older guy with not much hair but a short beard, sandy or ginger. I don’t think he was Trevor Howard, but he might qualify as a Trevor Howard–type.
Oh, and I think they were looking for a kidnapper in the episode I watched.
Ring any bells? :dubious: