Shame the clip has been removed and I'm having trouble remembering it to be honest. Listening to some of the bass notes it sounds like D based especially when Jimmy plays along superbly on top like on Stormcock. There are few options that spring to mind, apart from requesting permission from the copyright owners mentioned,you could send a begging enquiry for info to Roy's Facebook run by Tracey or download software that can print out the musical score?
Here's a beautiful tuning from Nick that's been mentioned and covered on here before in the Forum!
If I find anymore info will keep you posted. Minor seventh open tuning perhaps?
Chrs for noodles
Thanks for you attention Andi.
My favourite option, so far, is dropD (like standard but with the 6th string tuned down). This gets the best of both worlds: basically you keep the standard tuning chord shapes that many of you have mentioned on this thread, BUT use a flat barre for the power chords (much to Roy's taste). I think this option makes sense with most of what has been written here.
I'll probably give it a go one of these days. Just have to work out the correct voicing for the chords.