I also have one of Nic's John Peel sessions - copyright still belongs to the BBC, I believe. But his real strength in my opinion was as a live performer. I have a tape I recorded live in 1973 - his performance of Clyde Water was far more exciting than his recorded version - as was his Warlike lads of Russia.
Yes, the recording quality from a 1970's Cassette records was poor - but the gig is still electrifying.