Apologies Nigel and Pete I got one of the digits wrong for original ref but with a 10 fugure it turns out very close to the Silbury -Sanctuary line only 25 m max off . At just over a kilometre away from the Sanctuary that's not bad .
I've just discovered my wifes mobile has gps. I will try to get accurate measurements from Silbabys center, edge and base as soon as I can. PeteG
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