(Archive image from February 2006; each image was taken within 20 minutes of the other one).
In the medieval period the City was the full extent of London (as distinct from the nearby but then-separate City of Westminster), but the term London now refers to a much larger conurbation containing both ‘cities’. The City of London is still part of London’s city centre, but apart from financial services, most of London’s metropolitan functions are centred on the West End. The City of London has a resident population of under 9,000 but a daily working population of around 300,000.
The size of the City was originally constrained by a defensive perimeter wall, known as ‘London Wall’, which was built by the Romans to protect their strategic port city. However, the boundaries of the City of London are no longer the old City Wall as the city expanded its jurisdiction to the so-called City Bars such as Temple Bar. The boundary froze in the medieval period, thus the City did not and does not control the whole of London.
The same view 20 minutes earlier: