According to notes given in
Tyneside Maritime Chorus Songbook,
The Dustan Lullaby was collected in from Dustan Village, near
Alnwick,
Northumberland from the
Thompson Family repertoire dated in the 1850's. It was still being sung in the village as a lullaby at the time when
Ralph Vaughan Williams was collecting folk-song material.
For a definitive version, at least for my taste, one cannot find better than the beautiful rendering by
Benny Graham given below.
This song may be found in the Tyneside Maritime Chorus songbook