Barlow at Large (renamed Barlow, in 1974) was a 1970's TV series, starring Stratford Johns, in the title role, the same character, he played in Z-Cars, Softly Softly and Softly Softly Task Force, Martin Shaw, appeared in one episode (Asylum) of Barlow, below, you can see the episode of Barlow (starring Martin Shaw).
I've seen a clip of him in Z Cars. He was clean shaven and I think played an abusive husband.
"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?"