In browsing the Bodleian Ballad library, I have noticed that the only version of 'All around my Hat' was apparently a Cockney parody
All around my hat, I vears a green villow
I was interested to see that the tune was given as The (poor) fisherman's boy. Searching for that, I found two songs, The Poor Fisherman's Boy and The Poor Fisherman's Girl, both of which could be fitted to the tune that I know (as done by Steeleye Span). Does anyone know of a link between the two songs, which don't really seem to have much else in common?