This article accompanies the fable
A mile or two north of Cholsey is the town of Wallingford, where the Christies had one of their houses, Winterbrook House, from 1934 until her death in 1976. It is shown below. The River Thames is on the other side of the house, across a field.
Wallingford feels more like St. Mary Mead than Cholsey does, especially the picturesque St. Mary's Street:
Photo of Cholsey Church: Sarah Charlesworth