Not too sure about that, Tootler. Of course there are other versions of all the Copper Family songs; but you must remember that the versions they sing are actually "(c) Coppersongs". If one is singing a version learned from them, which they would sing from Jim's Book ~~ or perhaps Brasser's before him ~~ then one is singing one of 'their' songs, however it may be that other traditional singers have sung different variants. I can appreciate where this may be regarded as a debatable point: but, from the point of view of accuracy [& I have still to come across a valid argument as to the difference between the pejorative 'pedantry' & the essential watchword & principle that 'accuracy matters'], I still think I was justified in writing that "it's their song".