As noted from Daniel Radford (Mount Tavy, Tavistock, 1888), of course. The tune may be in Hitchcock, Folk Songs of the West Country but Roud doesn't specify. It isn't immediately obvious where the tune in Baring-Gould and Sharp, English Folk-Songs for Schools, is from, but the text doesn't match Radford's as printed (with dialect spellings regularised) in Reeves, Everlasting Circle.

If you can't get at a copy of Hitchcock (I can't help there), Martin Graebe is the man to ask.

Various other texts are in thread The Swapping Song