This heading, sort of, works for London and the "South" of the UK as well...
The "Square Mile" (UK's Wall St) speaks CASH in various dialects and flavours...
The "West End" (Broadway) has just about any accent and language you care to think of...
To the East, the call of the minarets and a mix of Arabic can be heard...
To the South can be heard the lilt of a Caribbean accent, with smatterings of Korean to the South-West...
Acton to the West has a distinct Somalian twist...
In North London there can still be heard, that Turkish and Cypriot twang...
As for that "Gore-Blimey Guv'nor..." call of the black-cab driver, East-ender... almost resigned to TV...
As for Londoners in general, over all points, Rumanian, Latvian, Chech, Slovak, Lithuanian, and not forgetting Polish accents, can be found everywhere...
I often have trouble remembering what London was like only a decade ago...
... and, with luck, we will be up for sale by the end of the month... my "handle" beckons...