It depends what version you mean?
I have started singing a version collected in my home county of Hampshire in England, which has a very different tune to that of the more commonly known song, and I believe that this is also being sung by fellow Mudcatter - Brian Peters, and by Paul Sartin; in fact Paul has recorded it with a choir on the re-issue of Folk Songs from Hampshire on Forest Tracks Records.
http://www.forest-tracks.co.uk/folk_music_pages/folk_music_folksongs.html

Tim Radford