I came back to have another look here nearly 4 years on from my initial visit, armed with more information and the benefit of 4 years intensive stone-visiting. Although Canmore describes 3 stones, there is a fourth, at a greater distance from the other 3, but on exactly the same ENE-WSW alignment. The 3 stones lie approximately 7m apart, the 'outlier' is 35m away from the most easterly of the 3. Not sure about this - it's not as large as the 3 in the row, but just looks and feels right. The most easterly in the row does have some possible weathered cup marks on the upper face.