Have now compared the various versions linked to on this thread: the notation posted by Guest 99 on 7th March is pretty much exactly as in the Youtube of Alma Gluck singing it: the are various was you could chord it, from a straight "3-chord trick" - D G and A, or add a few minors in places, Bm or Bm7, Em for a bit more interest.
The Tannahill Weavers (Les Wilson) have strayed quite a long way from that tune, and the McMorland/McIntyre version is entirely different.
I'm guessing Muttley is after chords for the Tannies' version, as we now know who Les Wilson is!