For directions to the general area, see the record for Mardon Down.
This is relatively easy to find because it is quite striking and because it's next to the junction of two relatively clear paths up the hill, one from the east and one from the north. I imagine that with more undergrowth it could be slightly less obvious.
This is a beauty. I'm not very used to cairn circles (not many in Southern England) but I would imagine with could be a pretty fine example, with nine standing stones, plus several recumbent and/or out of place. Despite the drizzle and mist the views were still spectacular.