Original: For example , Greater London is sometimes referred to colloquially as '' London town '' . ( The '' City of London '' is the historical nucleus , informally known as the '' Square Mile '' , and is administratively separate from the rest of Greater London , while the City of Westminster is also technically a city and is also a London borough ) .
Simplified: For example , London is a city , but people often call it '' London town '' ( '' the City of London '' is a part of London where there are a lot of banks ) .