Z-Cars further spin-off entitled "Second Verdict" in which Barlow and Watt looked into unsolved cases and unsafe convictions. Frank Windsor made a final appearance as Watt in the last episode of "Z-Cars", "Pressure", in September 1978, with Robins (John Phillips), the Detective Chief Superintendent from the original series who had risen to chief constable. Jeremy Kemp, Brian Blessed, Joseph Brady and Colin Welland also appeared, though not as their original characters. "Z-Cars" is incomplete in the archives. The period 1962–65 is reasonably well represented; though with big gaps. With the 1967–71 sixth series, when the programme was shown almost every week,
Arthur Fowler own London family and background. Arthur's original character outline as written by Smith and Holland appeared in an abridged form in their book, "EastEnders: The Inside Story". Bill Treacher was the first actor Holland and Smith had thought of to play the character, in fact, Arthur had almost been invented with him in mind. Both had worked with Treacher before on the popular BBC drama "Z-Cars". His qualities as an actor were exactly the ones they wanted for the "very difficult" part of Arthur: "Warmth, directness and an ability to be convincingly ordinary without being dull". Treacher admitted in 2015