You haven`t mentioned the one stone remaining of the Falkner`s circle, which is located not far from the last of the remaining stones of West Kennet Avenue.
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There's an excavation report at the Portal that has an excellent account of Falkner's circle. It's a good story ...
Indeed. It is however in my head; I'll park at Avebury and head over to Mother's Jam via Falkners Circle..