After 3 hours of hunting in the field up and down the tram lines, I came across the circle that I was told about. Got totally rained on in the flash storms. This is not visible anywhere near the road. it must be visible from the top of the hill only. But I came upon a small formation that contained 4 circles, 2 outlined and 2 solid. joined by lines. I would say the whole formation would be under 100ft.

Dene Hine