It is a pre-recorded show; and then broadcast “as live”. I relied on broadcast dates as recording dates are often unknown / lost in the midst of time.
The complication is that the broadcast (usually) starts - and its now been on for over 25 years) between about 23:00 and 00:00 - so the show advertised as being on 8th October 1992 may actually not start till the 9th October.
The problem is there are different sources of archive listings - for example the archive of Radio Times (the “official” listings magazine for BBC TV an radio) lists the show as being on 8th October; despite it not starting till midnight; but BBC website has it listed as being broadcast on 9th October because it started at midnight. Both are correct… from a certain point of view (as are many of the truths we cling to) …but conflict.
Also if you look at the DVDs and CDs commercially available; they will list the schedule date.
PS. I will add an annotation where this situation occurs.