This sort of permanent public art was what the Normans were all about.
'Permanent public art'? The Normans had no conception of the words 'public' and 'art'. Churches weren't equivalent of anything we might think of as public art. But they were built for permanence.
So that's one out of three. Anyway, mustn't jump all over it as it's not often we get lots of history - story-book history, no less - at prime time on a main channel. Fingers crossed that it doesn't sacrifice too much sense and meaning for supposed accessibility.