A BBC News story today describes an interesting new list of hills - Y Pellenig. Here the hills are only P15, but with the added criterion of being at least 2.5 km from any paved public roads. You can find more at the Web site, including a pretty brochure with information on their surveying and naming methods, &c, as well as the list itself.
I spot a few SOTAs amongst the list of course.
73, Simon