Hi, I have coped this reference from then OS map. https://explore.osmaps.com/pin?pinCoordinates=50.145131834759724,-5.663548124834676
It’s marked in the map but has no name. Which I thought was unusual for such a prominent stone. It’s covered in Lichen and looks like it’s been there forever. So who ever put it there in the 90’s dis a great job.

I think that is the Carn Eanes one, I haven't been up that path for about 20 years so it's hard to remember if that is where it was!