Z-Cars ran for 801 episodes. The original run ended in 1965; Barlow, Watt and Blackitt were spun off into a new series
Softly, Softly. When the BBC was looking for a twice-weekly show to replace a series of failed 'soaps' (one example being
United!),
Z Cars was revived. The revival was produced by the BBC's serials department in a twice-weekly soap opera format of 25-minute episodes, and only James Ellis and Joseph Brady remained from the original show's run. It was shown from March 1967, both 25-minute segments each week comprising one story. It ran like this until the episode "Kid's Stuff" (broadcast on 30 March 1971), shown as a single 50-minute episode for the week, proved the longer format would still work. Thereafter,
Z Cars was shown in alternating spells of either two × 25-minute episodes or the single 50-minute episode each week over the next 16 months. This arrangement ended with the showing of the final two-parter, "Breakage" (Series 6, parts 74 and 75, on 21 and 22 August 1972 respectively), after which the series returned permanently to a regular pattern of one 50-minute episode per week.
Lost episodes Like many series of its era,
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, material becomes more patchy still. Of the 416 episodes made for this series, only 108 survive: a few episodes each from 1967, 1969, and 1970, but there are no surviving episodes from 1968 or 1971. About 40% of the total 801 episodes are preserved. The original series was one of the last British television dramas to be screened as a
live production. With videotaping becoming the norm and telerecording a mature method of preserving broadcasts, the practice of live broadcasting drama productions was rare by the time the programme began in 1962. Going out "live" was a preference of the series' producer
David Rose, who felt it helped immediacy and pace and gave it an edge. As a result, episodes were still not being pre-recorded as late as 1965. Most were videotaped for a potential repeat, although the tapes – costed as part of a programme's budget – were normally
wiped for re-use. The transfer of a live or videotaped programme to film greatly enhanced its chances of surviving. In the 1980s, the telerecording of the pilot episode "Four of a Kind" was returned to its writer
Allan Prior by an engineer. He had taken it home to preserve it because his children had enjoyed the programme and as a result he could not bring himself to destroy it. This and two other early editions were released on a BBC Video in 1993. Two further episodes were returned in 2004 after turning up in a private collection; there have been other occasional returns of individual early episodes in more recent years. The return of the 50-minute format into regular use coincided with an increase in the survival rate, and all episodes from the 1975–1978 period are preserved in the archives.
BBC Archive Treasure Hunt was a drive to seek out missing episodes and is still open to information regarding missing editions of lost BBC television programmes. British vintage television enthusiast organisation
Kaleidoscope is also interested in the recovery of lost television shows, regardless of their original maker or broadcaster. ==Theme music==