Just a note for anyone desperate for a copy of Last Leaves - there's one available at BookFinder.com for just over $80 US (I'm not quite _that_ desperate at the moment).

Malcolm, I would have posted more if I knew anything else, but I already contributed my entire knowledge. I've been singing Martin's version of this song for years.

Coming back to Breton/British links, this may rate another thread if anyone knows anything, but it seems to me I've seen Jabadaw, as a tune or a dance, in both Cornish and Breton contexts, though I wonder if the Cornish was a modern borrowing from the Breton as they have tried to establish the "Celticness" of Cornish culture with the reintroduction of the language and suchlike.