Cupmarks are notoriously unreliable to verify - and opinions drawn from photographs should be disregarded - the wide shallow one that I saw in one of your pictures looked pretty good to me. I've seen similar ones on parish boundary stones in sw Northumberland. Nobody has told me that these cupmarks are natural, yet ( http://www.themodernantiquarian.com/site/2280/white_brow.html ), and, in Millstone Grit, flaws are very rare. Have a look for the image with the brick house in the background - that's the one.