As a result a property investment bubble feeds on itself and creates the london problem.
To reverse that you make it unattractive as a store of wealth and attractive as an active investment via renting it out. And you remove supply creation limits. You would decrease the unfair demand side by taxing them like a typical UK resident.
Also zoning policy usually doesn't help at all with typical height limits.
They bailed out all the banks to prop it up. After this help2buy (help2sell in reality) to have the govt underwrite risk when the banks stepped out.
This isn't capitalism.