The City of Westminster is a London borough and a city in its own right, situated to the west of the City of London and north of the River Thames. It was extended in 1965 to include the former Metropolitan Boroughs of St. Marylebone and Paddington in the north. The city contains most of London's West End.
... but not in the United States.
However, because the GBA has no region lockout, European games will work fine on a U.S. GBA unit, and apparently, even a player who knows ...