>Please please please see if anyone can work out if the white stone there is definitely
>from a non-Tal-y-Fan source.
How the bloody hell will I know? LOL
I looked it up on the Coflein database, where it's called "Cerrig y Ddinas Fort", so I've added that name to the site as an alternative.
All it says is:
1. Remains of a fort on a precipitous rocky peak.
2. Up to four discontinuous lines of walling, joining sections of crag, define an irregular enclosure, c.130m N-S by 70m overall, inner enclosure being c.50m N-S by 30m.