Minor info - I used to have a laser disc of Fleetwood Mac with John playing an Alembic in the songs (I believe it was Rumours). It was a typical looking Series I point body. That was a long time ago, so . . .
Anyway, looking for videos could be helpful. I saw a show on cable with Fleetwood Mac on it not too long ago, and John was playing a Tobias then. Shame on us both for that sin. Maybe the library or your video store can yeild some results. Uh oh, I just remembered that I think I have a bass book at work with one of his basses in it. If this is so, I will digitize the pic(s) and post em for ya.
Also, try this URL and put fleetwood in the search box:
http://www.dvdpricesearch.com/ You will get 11 hits on their DVDs. Three look to be stories of the band, with one being about Peter Green - Love that guy!
Note: I love this site. It lists the lowest prices for a given DVD at different store sites and has saved me mucho denaro over the years.