In the seventies I came across "Peggy of Greenlaw" in Ord's Bothy Ballads, where the words are given but no tune. I put them to the T&H tune, and started singing them around the West of Scotland folk clubs and festivals, and the song still makes occasional visits to my sets to this day.
I have not issued a recording of it, nor have I encountered any other recordings of the song, to any tune. I have passed the song on knowingly (and presumably un-) to other singers from time to time.
I have no idea whether I tapped back into tradition, and the song exists elsewhere sung to this tune, or whether I am the source of the song as you know it, either way Boab, find those words and start singing it again.
love, john