Julian Cope presents Head Heritage

Aye, all good observations Mr S.

Funnily, your comment, “My own view is that the stones that are dressed/worked/smoother faced on the inside are possibly built for 'religous/ritual' or something other than day to day practical use...” leapt off the page because that is exactly what you see at the Anglo-Saxon church at Greensted, where the 9th century oak walls are undressed (round) on the outside but dressed to a flat, continuous wall surface on the inside.

You have to experience for yourself what a continuous, flat interior wall of ancient oak feels like but it’s not a million miles removed from what you’re suggesting above.