It is not "fairly traditional" although both parties are now deceased it is a copyright work. Ok I know from experience both Calum Kennedy and Bob Halfin were rogues in their way, but singers and instrumentalists should try and respect their copyright, plus the cultural context in modern works.   Bob Halfin died in 1986. Calum Kennedy 2006. The song is therefore in copyright until 2076 and is published by Campbell Connelly & Co.    It was issued on a Beltona single in 1959, LP's and also sheet music.