It was probably the Welsh. People think the English are eccentric but I wouldn't be surprised if it was some kind of elaborate joke they conjured up after a piss up in the valleys.
"Ey Dai, you know what would be Hilarious?"
"If we took some of them stones down to Wiltshire and just sort of piled them up like, as if the Gods had left a riddle for the pretentious English."
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