Brixton

Brixton was a district of London on Earth. Drax, a Time Lord, was caught committing crimes to procure replacement parts for his TARDIS and served a prison sentence in Brixton. During his stay Drax picked up Brixton's local "lingo" to survive. The resulting accent and idioms remained part of his speech patterns after he left Earth and resumed his travels. (TV: The Armageddon Factor)

When Donna Noble went through a Metacrisis, "Brixton" was one of the words she muttered. (TV: Journey's End)

It was the destination of the number 200 bus, which ended up on San Helios. (TV: Planet of the Dead)

The Eleventh Doctor claimed to have briefly worked as a physician there, in a small medical office. (HOMEVID: Good Night)