I watched the first two series and enjoyed it a lot. I don't think I caught the third series, if I remember correctly it went downhill during the second series, but the first series was very impressive.
Like Daz and FS, I agree that the second series wasn't as good. Rachel Davies appeared in it but she wasn't glamorous like she was in the likes of Minder, The Professionals and Boon a few years earlier. The third series was just called Gold and Barbara Dickson didn't appear in that one.
"What was I thinking of, hitting him? Nothing. No, I know. I hate him! I hate his guts, I hate everything he stands for with his PACE and his plus and his statements of purpose and his smiling at the punters and his have a nice day! I mean when was the last time he ever nicked anybody, eh? A real villain! When was the last time he ever put himself on the line?"