Central City

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Central City was a city on Earth that existed by the 28th century. It encompassed the whole lower half of England, including London. (TV: "Strangers in Space") By the 30th century, the Seventh Doctor explained that it was "Spaceport Five Overcity," which used to be known as "Central City," and before that as "London." (PROSE: Original Sin)

In the year 4000, Central City was the capital of Earth, located in New Washington. (PROSE: Mission to the Unknown) The Space Security Service had its headquarters there. (TV: The Daleks' Master Plan)