There is so much to take in, from all these videos but I did notice that he mentioned the Stonehenge Bluestone circle down by the river, found earlier. I have no problem with MPP's personality, he comes over as sincere and exploring a possible theory.

The problem I think with the Presceli hills and all its archaeological sites is that they are very much under explored. Trying to fix magical powers to flying stones as Geoffrey of Monmouth did is perhaps not the right story to hinge archaeological excavations on. You have only to read 'Prehistoric Preseli' by Figgis to understand that there are many sites there, including stone circles, disappeared or otherwise.

A note from Figgis's book........

An 18th C record notes 'near Kily-Maen-Llwyd on a great mountain a circle of mighty stones very much like Stonehenge in Wilshire, or rather like the Rollrych Stones in Oxfordshire' The whereabouts of this demolished circle is unknown. Cillmaenllwyd parish includes Glandy Cross, but no 'great' mountain.