That'll teach me for not following the map ref you posted to TMA. I pondered heading over there, but spent so long walking up and down the hill on the other side...
My fault entirely.
Annoyingly they aren't marked on the orange OS map.

One thing I did see however were the 2 large recumbant slabs in front of the social science block. Kinda too regular shaped to be natural.

P.S. It was a gorgeous day :)