Julian Cope presents Head Heritage

Hi, I've been interested in these for the last few years.

Any serious studies on foot carvings done in the uk that you know of? It's a bit of a controversial topic round these parts (you may have heard of the 'enthronement' theory, Iron Age, etc). But they seem to be so common that even I have discovered one (on a very prominent hilltop, obviously) next to some other minor cupmarks.

But this is most obvious example, discovered only a couple of decades ago:

http://www.manuelgago.org/blog/index.php/2012/07/01/pezas-de-domino-o-calco-do-petroglifo-do-outeiro-dos-podomorfos/