Just to lob a small firework into this erudite discussion - as an East Midlander me duck, I have always understood that the "Floral Dance" tune was really a Morris tune from Derbyshire called "Winster Processional".

The Morris Ring via Google seem to confim this - their site says the tune "Winster Processional" was collected by either Cecil Sharp, Herbert MacIlwaine or George Butterworth and published in the Second Morris Book in 1909. Katie Moss's song was not published until 1911. So maybe Ms. Moss pinched the tune and get the royalties (not unheard of more recently). Or did some Cornish miners working up in Derbys. like the tune and write it up for the Helston Town Band?

(I'll get me coat....)