Re Ewan McColl songs: I think it was the presenter, not the performer who said or implied that "Shoals of Herring" was a Scottish song, but it would have been good to attribute it more correctly, and certainly Scotland is not the only place where herring was fished: most of the locations mentioned in the song are well south of the Border!.

I didn't know until very recently, that the tune for his "Song of the Fishgutters" was borrowed from an older song in the Stewart family tradition (Elizabeth Stewart sang a snatch of it at Girvan Festival - a song about Bennachie).

And I was just looking up "The Manchester Rambler": on Wikipedia and other sites it says the tune is borrowed from Haydn's 94th symphony!