[Final U.K. Date December 10, 1975]

I didn't want to open a new topic for this so I write it down here:

In the book "John Bonham- The powerhosue behind Led Zeppelin" Mick writes that he appeared on stage at the concert in Preston, Town Hall on November 27, 1971. I never found this gig listed on any concert-list. But it seems to me that it happened. He writes about it:

"...it was an extra date added the original tour dates hat been confirmed, so the gig was never written about an there were no photos....it was about the only gig not to be recorded on bootleg"

I'm surprised no one has made a comment on this yet.

How reliable is this source considered?