I think the point is that there was a lot of social housing and now there isn't, because it has been sold off under RTB.
I wonder where the low paid people who work in Zone 1 actually live.
The LA in the NW town that I used to live in, built literally hundreds of pensioners flats and bungalows in the 60s and 70s.
Most have been sold off under the RTB scheme with often with savvy relatives funding the purchases. The properties were often sold for peanuts. Funnily enough there is now a shortage of HA properties in the area.
It does seem comical for people to be paying 1m for a council flat that they would have looked on with disdain 20 years ago.