The unusual theme tune was programmed and played back from an analog sequencer (probably an upgraded MOOG 960) as true digital music sequencers were not available until around 1980.
The show was repeated again in 1975 or 1976 on ITV and then not shown again. It was thought the master tapes of this show had been lost or wiped for re-use as they were not in the Thames TV archives after they ceased being a regional broadcaster in 1992. However all the tapes turned up in excellent condition circa 2010 and the entire two series was released onto DVD. It is now thought that the series creator Bob Block (who died in 2011) may have 'spirited' the tapes out of the archives (or at least bought them off Thames TV) rather than let the be wiped.
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