These are the figures I found on wiki before I posted that comparison:-
Quote:
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London has a diverse range of people and cultures, and more than 300 languages are spoken in the region.[43] Its estimated mid-2016 municipal population (corresponding to Greater London) was 8,787,892,[3] the largest of any city in the European Union[44] and accounting for 13.4% of the UK population.[45] London's urban area is the second most populous in the EU, after Paris, with 9,787,426 inhabitants at the 2011 census.[46] The city's metropolitan area is the most populous in the EU with 14,040,163 inhabitants in 2016,[note 4][2] while the Greater London Authority states the population of the city-region (covering a large part of the south east) as 22.7 million.[47][48] London was the world's most populous city from around 1831 to 1925.[49]
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On a related map, London was shown as pretty much everything inside the M25, but yeah, figures vary a lot depending on where you define the boundary.