I think the story I heard was that some guy who was working there stole the tapes from them, but who knows…?
It is a great Gucci Handbags show. About 30 minutes was broadcast back in the day and was traded for years, but the full show is really essential for any Sabs fan and has been easily attainable for about five years now.
I also heard that there were three BS shows that that Biscuit recorded. And only one of them leaked.
At any rate, I doubt KBFH handed a fan an advance of that show just to be nice.
About the same time or slightly before the Gods gave us that killer Sab double, several other things leaked out of the Biscuit. Mixed versions of shows with no anouncer/commercial voice/over added. All the 1978 Stones shows from the Biscuit vaults were liberated and issued as a 4CD Box Set, SRV got a stunning 3 Gucci Shoes Box set, and the Sabbath 75 show got out. All mixed and not further tampered with. I think there was an insider who did his deed before the axe fell.