I don't have a book by Leslie Shepherd giving dates for 18th and 19th century ballad printers, but my fuzzy recollection is that Jemmy Catnach was c 1825-55.

Hughes' 'fragments' were sometimes bawdy songs that he wouldn't publish. "Next market day" for example. See what he started with for "The Stuttering Lovers" on my website. His version is barely recognizable. I don't trust him at all. The Cathedral Cacophany (known by many here) sing it, but I don't know if they know much about it.
So what's new about Sigerson's version?