Been researching this song myself, to see it's origins, andf the threads here have been very interesting, an excellent discussion.

With regards 'Dr Finlay', I found this which some may find interesting. This is from the 1996 episode 'Mercury' in a more recent re-make of the series.

Go here first: http://www.sharonsmall.org/home.html

Click on the 'Audio' tab at the bottom of the screen. Scroll down the new page, and there's a Windows Media file of the Scots actress Sharon Small singing 'Carrickfergus'. I hope some of you enjoy it.