Addition from Philip Baldwin: This church is located in North Yorkshire, mid-way between Helmsley and Kirkbymoorside and just north of the A170.
The sundial is still in place and you can see it at THIS LINK
To see an Ordnance Survey map click at THIS LINK
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An extract from The Mathematical Gazetteer of the British Isles created by David Singmaster
The original site is at THIS LINK