...that the Notting Hill Carnival attracts up to 1.5 million people every year, making it the largest street festival in the world?
...that it began indoors in January 1959 in response to the depressing state of race relations at the time? The UK's first widespread racial attacks had occurred the previous year.
...that a 2002 report by the London Development Agency estimated that the event contributes around £93 million to the London and UK economy.