Dunno, but I do know that he sent a whole load of 'real words' to the American folklorist, Gershon Legman. So perhaps Legman would be a good place to start.

Hugill did a booking at the Trawler on Liverpool Dock Rd. one night back in the 1960s. Whether he'd had a few or not, I don't know, but he came out with some of the 'real words'. The air in there was purple for weeks afterwards