Hi Steve,
Two things.
I don't think it is correct to speak of the Celts of pre-Roman Briton. It is more useful and accurate to either refer to the Celtic speaking peoples of pre-Roman Britain, or the pre-Roman Britains.
And the only source I can find right now on the web for your 'Welsh foot' says "There was a pre-Roman unit used by the Celts (the Welsh foot) of about 9 inches, derived from the Greek Pythic foot, its anthropometric form. This was retained by the Welsh tribes as they were driven westwards by successive waves of invaders."
Maybe there is a Greek Pythic foot, but I don't see anything else, from start to finish, that I think is correct about that sentence. I'll look around some more about this Welsh foot.
Doug
Doug Weller
Director The Hall of Ma'at
Doug's Skeptical Archaeology site::
[
www.ramtops.co.uk]