Ah, Banks of Sweet Primroses, the first broadside I ever bought, in London in the 60s, strangely probably a copy of the very first printing by Catnach as well. Although it was widely printed all with the same 6 verses I haven't come across any earlier versions so I'd say it was probably from the pen of one of old Jemmy's hacks, the ubiquitous John Morgan perhaps. It could be as late as about 1830.