MCGrath, I don't think there is much, if anything to be had in Scotland, in terms of video.
The last time Alex was in Scotland was the Glasgow Folk Festival in 1984. There was a tribute concert at the Tron theatre, Ramblin Jack, Hamish, Iain Mac etc. Alex had no singing voice left, but he was in great spirits, and was touched that the festival flew him over. He did some MCing. I missed the gig as my band was playing elsewhere at the festival that night, but I donated my band's PA, as we were using a house system.
I think Denmark may be a better source of TV material, as has been already said, Alex was unfashionable in the 70's in Britain, but was much loved on the continent. Denmark gave him a pension, despite the fact, I understand, he didn't qualify for one. It seems thay loved the big man so much they ent the rules. So I would look for material in that direction.
love, john.