I remember it as starting:
The moon shone on the village pump - it also shone on Nell
Was she pumping water - was she bloody hell!
Along came Dirty Dick the captain of the lugger
He wasn't fit to shovel shit the dirty little bugger.
He took her to a wayside halt - which wasn't very lawful
And when he took his trousers down the stink was bloody aweful.

It's mentioned in Spike Milligan's 'Mussolini - His Part in My Downfall' where he says that in 32 bars Blind Nell has more perversions committed on her than a victim of Caligula.