Original: The Mayor of London is also referred to as the London Mayor, a form which helps to avoid confusion with the Lord Mayor of the City of London, the ancient and now mainly ceremonial role in the geographically smaller inner-city region of the City of London.
Simplified: The Mayor of London is also referred to as the London Mayor, a form which helps to avoid confusion with the Lord Mayor of London, the ancient and now mainly ceremonial role in the City of London.