Supposedly none of the re-broadcasts have ever used the quad master. I guess it couldn't hurt to check.
That looks correct, as sadly the DAT is a later Genesis concert. I have just listened to some of it and the 2nd track is "No Son Of Mine" from 1991s "We Can't Dance", so the Knebworth gig is only on reel-to-reel (which I have found). Probably was broadcast in 2007 - thought it might be a rebroadcast I recorded from an earlier BBC concert.
What I have discovered is that my portable DAT which I haven't used in years won't play tapes, which is annoying as it has never had that much use. Luckily my full size DAT will.