EH put the circles at -
NY45711908
http://www.magic.gov.uk/rsm/22546.pdf
if that helps :-)
And Archsearch has NY41NE 31 at NY 4571 1908 (~81 fallen stones in a slightly oval 20x17m circle)and there is also NY41NE 2 at NY 45711925 (which is 65 mostly fallen stones in a circle 57' across).
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