Apparently this was already posted on "X Boards" (whatever forum that is?) back in 2004 by X Radical Blues, and he's recently reuploaded it again on the xradicaldreamers forums.
Even so it seems noone downloaded it or watched it back then because as far as I remember we've only had that one recording of the very end of Burn on youtube and have been looking for the rest since, but anyway here it is, thanks to X Radical Blues.
http://sharebee.com/0d3560faThere's two seperate videos, one for Led Zeppelin's Rock N' Roll and another for Deep Purple's Burn + interview
And there's a third video which is both songs + the interview all together, nothing cut, the audio sounds more blurred/muffled than the seperate videos though, but I think Toshi's voice might be slightly more clear, I'm not sure, I suggest watching all three videos to compare.
Instrumently the band did really well, and Toshi sounded better than I thought he would, he went off key a couple of times in Burn and didn't go all out falsetto wise Glenn Hughes style like I hoped he would though, but its still really awesome.