New London was the capital of New Britain in 2199 and 3550. It was built on the remains of old London. St Paul's Cathedral and Big Ben were two of the few older structures still standing.
History
Lord London and Mar-Kom ruled from New London until its destruction. (PROSE: Legacy of the Daleks, COMIC: The Eternal Present)
The United Planet Building was in New London. (PROSE: The Secret Struggle)