I have just bought the book "My Father's People" by Brian C Luxton, which turns out to have no relevance to me whatsoever! Here's a description.
It's very dense and well researched and mostly (completely?) about the descendants of Robert Luxton 1664-1751 of Frogpit Moor, Petton, Bampton, Devon.
If anybody, now or at some distant point in the future, wants me to look for a name in here I'm more than happy to.