Yep, and so are many thousands of people who service the center of the city. Central London relies upon cleaners, bus drivers, care workers, assistant teachers, nurses, street-sweepers, sewerage operatives, uber drivers, pizza deliverers etc etc etc... all of whom make up the underpaid underclass that keeps the city ticking over. They earn sod all, but without them the City would grind to a halt, the public spaces would get fouled up, transport would collapse and people would be neglected.
None of them can afford to live anywhere near where they actually work, for obvious reasons. So you have a disfunctional city that requires commuting long distances, even of the workers who are paid the least. Some are even catching their sleep on the night buses between jobs, unable to afford outer London rents let alone anything vaguely close to where they work.