The Padstow farewell shanty as it has become known, has at best a tentative link to Padstow.
That link is through Mervyn Vincent who lived in the area and introduced it to the Padstow singers who adopted the song into the the local repertoire.
The story of it's source is covered by myself and BillE further back in the thread.
As is often the case subsequent "folk experts" have created a mythology around it.
It became widely known through the singing of Johnny Collins who learned
while visiting the west country