Annroi and Big Tim,
I have just reviewed the tape that I mentioned above. It was produced in 1995 by Gaelmedia. The narrator is Dervla ni Churraighin, it was filmed in Limavady, Belfast Castle, SW Donegal, the Sperrin Mountains and Carrickfergus, also at the Ulster Folk Museum.
In part 5 she states " Today Carrickfergus is renowned for it's castle, and although experts claim that the famous song is about another Carrickfergus in Kilkenny , most people associate the song with this Carrickfergus".
I must try to find some old maps of Kilkenny.

Jimmy