Whereas this guide is not definitive, it is as accurate as we can make it -- so far! It's not possible to be sure about certain appearances without being able to watch the shows again, because printed guides of the time, such as TV Times, occasionally included performers in the cast who ultimately did not appear, for whatever reason.
The BBC Archives have a "programme as broadcast" feature whereby one can see exactly who appeared in a show and what they sang, etc., but as far as we know, there is no commercial TV equivalent.
So if you spot any omissions of performers which you are confident *did* appear, or conversely any you are certain *did not*, please let us know!