Jon calls this “A funny little nursery rhyme from Tim Hart and Maddy Prior. I’m sure the first verse must have some profound metaphorical significance…”
I think it’s destined to remain a mystery if it does, as there seems very little I can find to add to this. Goggling simply brings up a mass of religious stuff and adding nursery rhyme to the search only makes matters worse. Mainly Norfolk at least has Maddy and Tim’s notes with the obvious reference to Oliver Cromwell and King Charles, although that says nothing about the miller’s identity and what he’s got to do with anything. I don’t know whether any of you have any special insight into this but I am very wary of attributing meaning to nursery rhymes and in that respect this Wiki page makes for quite interesting reading. Still please add below if you can, but I caution against Googling as you’ll need the patience of granite to wade through the guff you’ll find.