Thank you! They are quite easy to find. Head up past the NT house (Plas y Rhiw?), and there is a tight left-hand bend. Don't follow the road to the left, go straight on up the dirt track, and that pretty much takes you to it. However, the footpaths in the area were not great, mainly involving barb wire. Worth it when you get there though, the two chambers are great. Didn't try to get in the chamber, as I was being attacked by varius farm animals (horse, donkey and irritating dog). Great views too.

We went to Sling too - that was pretty cool too, so thanks for your posts encouraging me to go.

sam