David Thomas of London has alerted me to a couple more snippets from John Peel sessions available via youtube:

Nic Jones - Two Songs From 1973 Peel Session - contains O'Carolan's Concerto (already available separately) and Isle Of France; the other 2 songs from this session are not on the tape that these tracks came from, although I have a fragment of one in my own collection (The Blind Harper, recorded off air, but only the last 3 verses!)

Nic Jones Blackthorn stick/Dr O'Neill (from Oct 1974 session, broadcast Nov 1974)

The uploader of the last says that "William Glenn" aka Captain Glenn from this session was included on "Unearthed", however that seems to be a mistake since that song was not recorded for Peel Sessions until 1977.

- Tony