According to notes given in Tyneside Maritime Chorus Songboo
k, The Dustan Lullaby
was collected in from Dustan Village, near Alnwick
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
This song may be found in the Tyneside Maritime Chorus songbook