Sadly I don’t have any original recordings. I don’t think my Dad does either. I’ll check a couple of other sources and let you know if I find anything.

Regarding your comment about the master tapes, I don’t think it’s very surprising to be honest. Even more recent shows wouldn’t necessarily retain the raw audio. It’s hit and miss with most shows what’s retained. The slightly more concerning thing is whether the edited versions become the new masters.
That would result in the original versions being lost altogether.