It comes down to how 'London' has been defined throughout the ages. Throughout history, when people mentioned London they were always referring to the City of London, and anything outside of the city walls was an additional enclave. It's around 1889 that Greater London and the Metropolitan Board of Works become a thing – later developing into Greater London boroughs – but London is still just the City.
As the population of the boroughs grow and local government changes, what is technically Greater London is often referred to as simply 'London', therefore why it's confusing that the West End (the western-most edge of the City) appears in the middle of 'London'.
It comes down to how 'London' has been defined throughout the ages. Throughout history, when people mentioned London they were always referring to the City of London, and anything outside of the city walls was an additional enclave. It's around 1889 that Greater London and the Metropolitan Board of Works become a thing – later developing into Greater London boroughs – but London is still just the City.
As the population of the boroughs grow and local government changes, what is technically Greater London is often referred to as simply 'London', therefore why it's confusing that the West End (the western-most edge of the City) appears in the middle of 'London'.