On the side of the Avon Dam , where it looks like the photos are taken , are two settlements , one large with numerous hut remains in it and one smaller one with 3 or 4 hut remains in it. If you can have a look at OS 28 map , that are at SX677658 approx.
No Lubin, this is approaching Brockhill Stream from the east, that is north of Gripper's Hill. I visited the settlements you mention looking for the sadly underwhelming cist.