I popped your grid reference into the Heritage Gateway and it came up with this http://www.heritagegateway.org.uk/Gateway/Results_Single.aspx?uid=MDR4165&resourceID=1023 which sounds like it could be your circle?
Fraid not, the enclosure you suggest it a few fields away the other side of Moorside Farm, the site I photographed is closer to Birchen Edge.
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