Can't help you on that front alas. But do you like my bit about the Radnor font??! http://www.themodernantiquarian.com/post/62541/folklore/old_radnor_church.html (It's probably tosh but at the moment I am basking in the possibility).
...On the 'Four Stones cursus' query - turns out to be an alternative name given to the Hindwell one. At least that mystery's been solved!
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