Earlier in this thread Malcolm Douglas mentions that Dr. George Gardiner collected the song from Frederick White in Southampton Workhouse (White was in the Infirmary with an ulcer of the leg - and he was an Australian born ex-seaman) and when first collected in June 1906 by Gardiner he sang it without a chorus.....and then later (date unknown), when it was recorded on a Cylinder - White sang a chorus -
"I-O, I-O, he is my darling boy, He is the darling of my heart upon the walls of Troy."

This is the Only time a chorus was recorded for this song!!!

IMO - Vaughan-Williams DID NOT record it (as has been suggested elsewhere) - he only transcribed the recording made by Gardiner....

Tim Radford