Here's a photo I took of the site from Righters Mill side yesterday:
https://drive.google.com/file/d/1C2-IaVYKAN_kpuClLTRNkE14ebT-KaSY/view?usp=sharing

It seems as though there is no way the grass would be in that condition if it was never mowed. It isn't prolificly maintained, as there are oft branches down, but I suppose it's still maintained enough to be landuse=grass in the end?