Hi James, thanks for your reply. I can understand how you didn’t see the site, because at some points where the path had disappeared or become blocked, you had to choose between going higher up nearer the fields, or lower down nearer the river. The site was indeed near the top perimeter of the woods near the fields, and it’s only visible when close to it, so would be easily missed if you walked past it lower down, and I’m not even certain I’d go exactly the same way if I tried again, due to the options of taking different routes when the path runs out or becomes boggy, etc! However, there is a narrow path running alongside it for a short stretch, which I guess is used when the site is inspected periodically for security/safety. Difficult to estimate exactly where it was, I’d guess about 2/3 of the distance to Hartford Bridge, I think some time after passing the attached structure (not sure if that’s one of the structures you mention). Maybe I’ll try again in the summer when the path is hopefully not so muddy at some points, and try to get a photo of it!