Still no tune for Hey Randy Dandy, though I did come across this at Levy:

She's Sweet As Sugar Candy, Oh! or Galloping Randy, Dandy, Oh, written and composed by C.J.Sansom, published in London by H. D'Alcorn & Co., 351 Oxford St., no date.

which has the chorus:

  Oh I, oh I, oh
  She's as sweet as sugar candy, oh,
  We're going to be wed in a week or so
  Galloping Randy Randy oh.


If, as Hugill says, galloping was a camouflaged word in the printed choruses (of the shanty), it seems at least possible that it came from galloping in the first place!

Mick