Hmm. So the nave was widened taking in some stones that were knocking about outside but not moving them..?

Not quite sure what he meant by 'bogus antiquarianism' - do you think it means that they were digging up the floor and they found the stones, thought 'ooh that must be something significant' and redid the floor with some trapdoors. But really they weren't nothing special. Quite a lot of trouble to go to. And I wouldn't imagine many people were into 'antiquarianism' in the 16th century, surely?

It's all very interesting, thank you for all your (ongoing) researching