London buses were not always red. Before 1907, different routes had different-colored buses.
Big Ben is the bell, not the clock tower. Its chime is in the key of E.
The Beatles played their last gig on the roof of Apple Corps at 3 Saville Row. It's now an Abercrombie & Fitch store.
Only one house where Charles Dickens lived still stands, at 48 Doughty Street, which is now a museum. He lived there from 1837 and 1839, and it's where he wrote Oliver Twist and The Pickwick Papers.
Arsenal are the only football team in London to have a Tube station named after them. The station was called Gillespie Road and was renamed in 1932 after the team moved from Woolwich to North London.