Sorry. I was a little over-excited at been able to do the blue clicky and I neglected to mention that on the site I was directing you to the words of the song are listed. There is also a reference to a songbook by Patrick Galvin. The tune in that book is quite different from the one sung by Kevin Mitchell.
As a small note of interest, Kevin sings the song unaccompanied and with each verse he raises the key by about a semitone. This was, to me, totally imperceptible until I was asked once by a friend to transcribe the tune.