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Do you mean British citizens, British Commonwealth subjects, people born in Great Britain, people born in the British Commonwealth, people of British ancestry, or people who speak English? Do you mean the largest numerically, or the largest proportion within the city's population, or the city where they form the largest compact identified community, or the city where they most conspicuously cling to their British culture and traditions? You could have ten different answers, depending on which of those the OPs question is asking about.