In Yorkshire they seem fond of laying walls over rock art, in Cumbria they seem particularly fond of bisecting circles. Just a few examples
http://www.themodernantiquarian.com/post/37001
http://www.themodernantiquarian.com/post/35645
http://www.themodernantiquarian.com/post/30180
http://www.themodernantiquarian.com/post/19198
http://www.themodernantiquarian.com/post/45689
http://www.themodernantiquarian.com/post/43221
http://www.themodernantiquarian.com/post/42600
http://www.themodernantiquarian.com/post/41423
http://www.themodernantiquarian.com/post/38303