macausland wrote:http://ads.ahds.ac.uk/catalogue/adsdata/arch-352-1/dissemination/pdf/vol_128/128_425_440.pdf
I don't know if it adds anything to the discussion here but it's quite interesting.
It's
very interesting! The north-south 'Belinus Line', beginning (or ending) at Plymouth Sound, looks like it crosses Worm's Head, at the Gower Peninsula, and the Menai Strait separating Anglesey from north Wales. But it isn't easy to make out all the details.
I've noticed on some of the old mediaeval maps and before that the British Isles always seem to be an odd shape and at an odd angle. This seems to be because the central point seems to be based in Egypt and looking north west Britain is seen almost in perspective. It's as if it is following the curvature of the earth. Perhaps there was a problem with reconciling a flat surface with the spherical nature of the landscape?
That's plausible, working outwards from the centre.