I agree with your interesting remarks about the Bridestones. The area from the stones north to the Firth of Forth was the territory of the Brigantia tribe of Celts whose name derives from the goddess, as you probably know. I have posted new info on the stones today, 7th October, 2015, under the name 'anonymous' because I cannot log into the MP site. I trust you find my additions informative. Draconis.
Something is not right. This message is just to keep things from messing up down the road