The origins of Walton?

Walton is derived from "wall town" which was used centuries ago to indicate a location outside the Oxford city walls. The ancient manor of Walton was certainly in existence before the Norman conquest in 1066.

Margaret Thatcher used to live here?

In her Oxford days, she lived at 12 Richmond Road. It is alleged she shared the house with two red-hot communists who lived on a diet of sausages. This may account for her later views on socialists and known dislike of sausages.