London, just taking a trip from central London going outwards you will see a difference, the Chinese community in Chinatown, the Polish community in Ealing, Pakistani/Indian community in East Ham, Afro-Caribbean in Brixton and the Aussies & South Africans in Richmond.
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Derry is a lovely city and one of the finest examples of a walled city anywhere in the world, granted it has its problems but then any city does.:)