I have never been there but had a quick look at the main web-site for Winterbourne Abbas which included this paragraph:

Winterbourne Abbas is surrounded by ancient barrows, most notably the Poor Lot group of which some are now no longer apparent having been ploughed to a level well below their original height. One very special feature remains however and that is what is probably Dorset's best example of a standing stone circle. Known as Nine Stones, the circle lies beside the A35 isolated from the village to the west and surrounded by trees. Amid the constant thunder of passing traffic the circle retains an air of tranquillity of its own. This area generally contains a considerable amount of ancient burial chambers and once-standing stone circles.

Certainly a contender