I stumbled across an episode of Budgie recently too, same channel I think, the episode where Budgie tries to sell a pile of pornographic books to an ex-teacher. Didn't stick with it.
However, I did stumble across Public Eye with the excellent Alfred Burke a few months back. It was one from around 1971, though the series stumbled from black and white to colour, (and briefly back again due to a technicians strike), during it's near decade run. Although the production values were a bit hit-and-miss (painted outdoor scenery etc) the stories were excellent, and not always "good guy wins" for his character did end up in jail at one point, and has trouble rehabilitating on getting out.
Not currently broadcast, but available on DVD as "A Box Named Frank" which contains all surviving episodes, only 5 episodes of the first 3 series as ATV recorded over them!