With regard to the 1970 Kenny Everett tapes I believe the dates are 16-May-70 and 6-June-70. He says in the first tape he is about to go on holiday in Spain, and in the second that he has just returned. While he was away Dave Cash sat in on his show on 23-May and 30-May.
Thank you Neptune. I will amend the POTP date accordingly. That's fascinating to know that the Caroline off air recordings are from the very first week. That makes them even more historically significant. I'll certainly amend that details to. Don and Jean in Benfleet gave me access to all Buster's tapes in the 80s and I don't recall them having the dates on boxes. Excuse sporadic responses. I'm finding this site very clunky to navigate. Can't get on with the format and layout at all.