[peel] Another mysterious audio featuring Peel. Any ideas where it comes from?

[johnpeel3904@...]

According to Ken Garner's Peel Session book, Peel's show got 5 nights a week from 29th September 1975. The Boxer session was first broadcast on 10th November 1975 (there was no other bands doing that session on that show according to Ken Garner's book) and repeated on 30th January 1976 (also no other bands doing a session on that show according to Ken Garner's book). But on the audio, Peel says that he'll play two classic sessions, one of them is Boxer. The way he said it, sounds like Boxer's session was done some years ago.  
 There is a possibility that the audio maybe a show from the early 80's called Peel's Pleasures, where he did have archive 70's session tracks played, but the voice of that doesn't match the one in the audio. In the early 80's, Peel's voice was quite different from his pre-punk 70's shows, so it can't be that.