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,
Paul Smith (American actor, born 1929) mentioned that Smith was divorced and had custody of his 11-year-old son Neil with whom he was sharing a small apartment in the San Fernando Valley. Paul Smith's credits have been frequently commingled with those of two other American performers — cowboy musician Paul "Clem" Smith who made unbilled appearances in seven western films between 1946 and 1948, and a later actor (1960s to 1990s) whose name appeared on many occasions in credit listings as Paul Smith — as well as with credits of the 1980s and early 1990s actor (born 1968) who, during his teens and early twenties, while