"On Ilkley Moor baht 'At" was pinched from Thomas Clarke's tune "Cranbrook" which was originally used for "While Shepherds Watched" (and other sets of words).

I was part of a vocal consort which sang Clarke's original setting at a carol concert. A lady in the congregation took us to task for "using such a disreputable tune for a christmas carol - in the house of God as well !". Even when we explained the origin of the tune, she insisted that it was now "contaminated". I can remember thinking that a quick recital of all the bawdy words which I knew to religious tunes would leave her with very few singable hymns and carols.

Perhaps it is more dificult for a "tainted" tune to return to respectability than for a camel to squeeze through the eye of a needle !