Spent all afternoon yesterday trying to get to this circle via open access land...without success. Barbed wire, conifer plantations and knee high grass and gorse plus quite a lot of marshland were all put in my way.
Phil’s suggestion back in 2001 may still be possible but you would need to ask permission at the farm.
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you could try approaching from trezibbett farm. The folk there should give you directions although the circle is obscured by a conifer shelter belt and not at all obvious.