Malcolm, I am familiar with that thread. My source of the song is a little book called '101 Scottish Songs', selected by Norman Buchan and published by Collins in 1962. I have a 1972 reprint. Buchan's note at the top of the song says "Trad. Gaelic arr. Robertson", and in the 'Acknowledgments' he credits the copyright to J Curwen & Sons Ltd and states his source for the song as 'Songs of the Isles', which was edited by Hugh S. Robertson. Not having access to 'Songs of the Isles', I can't comment on whatever notes may be there. Buchan only gives two verses, and a slightly different chorus from that in the DT.