Thanks to Jonathan too.
I can certainly update this occasionally if that would be useful. As it stands, comparisons between different areas are influenced too much by how widely the area is drawn, so Edinburgh for example (which in reality is very thoroughly mapped) looks as though it is below average (orange) because the hinterland around it in the Naptan area is so large. It's a thought that maybe trends over time in the same area will be more useful than comparisons between areas.
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