I do a composite version of Billy Boy which uses various sources ranging from Gloucestershire to Northumbria. The Northumbrian bit comes through particularly in the "And me Nancy kittled me fancy" and the "Can she make an Irish stew?/Aye, an' singin' hinnies* too" lines...

Unfortunately I've lost track of where these came from. But I got the "She is twice six and seven/She is twice twenty and eleven" and the general groove from Eliza Carthy's version.

*a kind of tea cake or scone.