I went to a check on a new area today, as 2 of my original survey sites have been dug up for development! I came across the attached, which, while I think I know what they are, I need confirmation, as if I am right, then it will be a +3 for my list. I will not say what I think they are as it might prejudice your own thoughts. I apologise for the quality of the photos, but they would not let me near, and I don't have a zoom lens at present.