Where is Knightsbridge in 'The Book of Hours'?

Virginia writes:

The Book of Hours is my first book of yours that I have read, and I'm excited to be aware of you as an author. Loved the book, but want to know where the village of Knightsbridge is located. Is it a real place?

My Response:

I am thrilled to learn that you connected with that sweet story, one which has remained very close to my own heart.

As to your question, Knightsbridge is fashioned after Wallingford, a very ancient village at the base of the Chiltern Hills, about twenty miles south of Oxford. Wallingford was the first capital of the Norman conquerors, from which they prepared their assault on London. It was also one of the key bases for Oliver Cromwell during the civil war. So that much is true.

And next door to our home was the manor on which this story was based. But the tunnels connecting that manor, and the underground chapel, are all legends. They are supposed to be there. But no one knows where. In fact, the original Norman monastery could well have been placed below our own home. It was this lack of clarity that caused the publishers to ask me to change the village's name.