Hello Tim, I am actually looking for the lyrics of this song, too, but at the same time I am lucky enough to be in possession of a CD of B.Britten's folk songs arrangements where the song titled "The plough boy" is included. It is a recording featuring Benjamin Britten and Peter Pears. It was published under the DECCA's "LONDON" label in 1990. Hope this is of some help to you.

Best regards

Robert