Earlier quoted context omitted.
There are a good number of places in the world where people of varied incomes live relatively close.
London tends to get that because it has never really been planned. It just grew over the course of 1600 years and absorbed other areas as it went. There are plenty of areas where a row of £20m+ homes are opposite blocks of 3-bed flats that go for a hundredth of that price. Hundreds of years ago, before the rail or underground network, you still needed plenty of working class to live near where the rich people lived a…
Not particularly true.
Go to a city in the world that REALLY has "never been planned", then come back and tell me London hasn't. ;)