Wellington UDC Sewage Works were just beyond the end of the blocks going north.
https://maps.nls.uk/geo/explore/side-by-side/#zoom=17.3&lat=52.71466&lon=-2.53383&layers=193&right=BingHyb

I think a water pipe or sewage pipe was supported on those blocks many years ago, they look pre war.

A big thank you to all you wonderful volunteers, what an amazing paradise you have developed.

What are the large concrete blocks that are along one of the paths in nature reserve walk please