Phewf! It was quite a hike from Afan Argoed to the cache -- the GPSr recorded 13.0 km on the odometer. We took a circular route, using one of the routes from a free map sheet available at the visitor centre.
The weather was warm and clear, with great views out across the valley below.
We found the cache pretty quickly. It was dry and in good condition. We enjoyed the ruins, and we had them all to ourselves. In fact, we hardly saw another soul all day.
Thanks for an interesting and a rather unusual cache on a Bank Holiday Monday!