Chantelle,
I don't know of Billy Connolly's version, but according to a past thread, the song is available performed by Dubliners, and can be found on their CD from 1992. "30 Years A'Greying". If you want to know more about the song, it has come up twice on the forum. CLICK HERE and you will get the most recent thread. Within that is a link to the first thread.
Good luck with the song!
Roger in Baltimore