Have a look at this webpage, and the associated ones - http://www.eng-h.gov.uk/mpp/mcd/sub/lb1.htm . If I pontificate, just from these photographs, the thread will mutate into a vitriolic flame spat; so I won't. But that little mound - and it could just be a pile of field clearance boulders - lends strong support to the hypothesis that Hall Hill is a Neolithic L. B.