I heard a friend sing this at Balerno Folk Club last night, which prompted me to come back to the thread and look again for the words! Thanks for posting them, Frank.
I never realised it was Frank Rae who had written it or I could have got them off him a while back.
The Eyemouth Festival was one of the earlier Both Sides the Tweed festival, and I later (next year) saw the same chap sing it at Stonehaven Folk Festival in the Chorus Cup competition, which he won. Don't know his name: dark hair and thick black-rimmed glasses. Don't know if that will ring any bells with Frank.