"Dunno.... it does look rather like what we've logged as the Poppy Stone:

http://www.coflein.gov.uk/en/site/521360/details/PEN+Y+RHIW+IAR%2C+MONOLITH/"

Ah, you are right- that is it. Hurrah.
We told them about it a few years back and they said they would investigate but we ever heard back. Looks like they put it up last year.

Ed - can this be change from 'disputed' now?
Cheers