So, I've pulled all my recordings of the Britten folksongs. I see I no longer have the Brightman recording, it was EMI, but I do have many. On Maria Jette's recording, she sings "Schoolwife," as do Robert Tear, Elizabeth Soderstrom, and Peter Pears who recorded it with Britten in Jan. 1944. Jamie McDougall and James Griffett sing the original text, which may have been a publisher's error and not Britten's. The song was first performed, according to my friend Donald Mitchel's definitive catalogue of the Britten oeuvre, in concert, Grand Rapids, Michigan, November 26, 1941, and first recorded in 1944, using the School Wife text.
Donald is Britten's executor and he says this:
"As soon as Britten realized that the text , whether historical or not, perpetuated an ugly racist myth, he had it amended to read School Wife. . . However, since copies of the original edition are still in circulation, the Britten estate has requested that all possible care be taken to ensure that the song is only performed in the version Britten wanted heard." I guess the estate isn't to happy the the Hyperion Records and James Griffett!