Again, the City of London (1 sq mile) is not London and the UK has a rather convoluted municipal system. The comparable region would be a borough, like Manhattan.

I used the term Greater London to try to make the distinction. I failed you.

Since the toll and comparative congestion pricing are municipal concepts, the arbitrary sizes matter for the purposes of figuring out consequence. The post was not very illustrative, since I compared LA to London, as opposed to NYC to London. The greater LA area just happens to share arbitrary terminology to my choice of description, rather than specific relevancy.