Hi David, I don't think the site not being shown on Coflein means anything. I also checked the side-by-side OS maps Anne posted, looked at 2 known places where there are ancient sites at SO316077 and ST276850, and the OS map had nothing.
I'm not saying the sites at Garnteg are ancient, I'm just saying because there are no references to them on old OS maps or Coflien doesn't mean they should be discounted.
Something is not right. This message is just to keep things from messing up down the road