London is a city in England.
London [ ˈlʌndən ] is the capital and most populous city of England and the United Kingdom . London 's ancient core , the City of London , largely retains its 1.12 sqmi medieval boundaries . Its estimated mid-2015 municipal population ( corresponding to Greater London ) was 8,673,713 , the largest of any city in the European Union , and accounting for 12.5 % of the UK population .