I've done some deeper research : they ultimately lost the case They then sued their lawyers for giving them bad advice !
So in answer to Ash 1 -it's no good lobbying Mick about the release of the In Concert material, you'll have to lobby the BBC and they would have to renegotiate with the artist ie Fleetwood Mac in this case ,and given the outcome of the court case I doubt Mick (out of pique )would agree (unless the law requiresit to be Fleetwood Mac, as they were at the time it was recorded , as a single entity ,that must agree ,in which case it may be irellevent what he thinks .)
http://www.musiclawupdates.com/?p=2146
Surprisingly it has been mentioned before here
http://ledge.fleetwoodmac.net/showthread.php?t=39758