There are a couple of tribes of people that live in Caithness, they claim they are picts by origin. I description is worthwhile.
They are short stocky people, about 5 feet 5 tall. Black hair, dark skin, one in a hundred has the most vivid sky blue eyes, head size and shape is a very good indicator, picture a 3 gallon pale with eyes and mouth..
Males and female and Immature are indistinguishable apart from size, but even that can throw one. Very soft spoken, but also communicate with various gruntal tones.
I have seen similar but not the same in other parts, the bogghoppers of the Irish slobs are similar, The Southport banks, dwellers[original] are similar and finaly the north Norfolk flat foot are similar, but non match the Caithness pict in there looks and incredible behaviour. therefore I conclude that they are the purist form.. Hope that helps with you research.
PS somewhere I have a great photo of the picts lounging about semi naked in the cliff side cave homes.