Can't recall Carthy's tune but MacColl sang the superb Aberdeenshire one collected by Gavin Greig on one of his early Folkways Child Ballad ones - presumably included in the Greig Duncan collection as 'Sweet William'.
When she was compiling The Essential Ewan MacColl songbook she said that he used this tune as the basis for a number of his songs, most notably, 'Shoals of Herring'.
Jim Carroll