Many thanks, Noreen and Martin. I did put 'Innisvaddie' into the forum search before posting, but came up with zilch - one of those mysterious glitches, I suppose.
It looks like the text I posted is a non-dialect reworking of the poem. It was given to me by Phil Beck of Perth (Oz) who had no idea of how he came by it. How does it compare with Len Graham's text? Years ago, I gave Phil a couple of Len Graham's solo LPs and he was enthused by them - he may have bought the relevant Skylark album and learned the song from there, and then forgot.
I want to use it for a presentation I am working on, and segue it with an unusual version of 'Katy Cruel' that was posted to the forum, suggesting that a baby was the cause of Katy's troubles.