I'm curious about the "folksinger" tune which Jo Taylor posted. I found a clip of it on YouTube--mislabeled "The Boar's Head Carol"--, sung by Herga folksingers. But in looking for alternative tunes to the relatively recent Sharp/Clayton one, I've only found printed music for the modal one supposedly of French origin. For instance, this page at the "Hymns and Carols of Christmas" site has multiple sheet music scans and a MIDI of the "French" one (and Sharp's).

Does anyone have information on the "folksinger" tune (6/8, major)? Was it perhaps lifted from another carol or song?