Dave, did you read this entry from the illustrious Malcolm Douglass?
It appears to answer your last question.
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Penguin: Lovely Joan

Subject: RE: Penguin: Lovely Joan
From: Malcolm Douglas - PM
Date: 27 Nov 06 - 06:45 PM

"Stooks are a lot smaller than stacks; I'm not entirely sure what "pooks" are in this context, but it's worth mentioning that they don't belong in 'Lovely Joan' at all; Bert Lloyd transplanted a verse from a completely unrelated song ('Blow away the Morning Dew') for reasons of his own. It was a Somerset version, so I'd look for "pooks" in a good dialect dictionary. "