London is in Greater London.
London , or Greater London , is a region of England which forms the administrative boundaries of London . The Greater London Authority ( GLA ) is a top-tier administrative body for Greater London , England . London . Since at least the 19th century , `` London '' has also referred to the metropolis around this core , historically split between Middlesex , Essex , Surrey , Kent , and Hertfordshire , which today largely makes up Greater London , See also : Independent city § National capitals . 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 .