you are deluded if you think the 50's were a golden age, rationing for one thing, massive bombing campaigns by the Luftwaffe put paid to much, London didn't really start rebuilding many areas until well into the sixties, we had outside an loo, freezing cold and full of spiders, yuck, and no heating apart from the smoky fireplaces.
come on it was not rosy, and the thing is whilst some things have improved, sanitation for one, and decent heating, hot water systems, much has not. And the poor have claimed the capital, we have more refugees and asylum seekers in our borough and London than the rest of the country. It's also true we may have many rich, but many don't actully live here, they own the large properties as investments, and the councils are trying to address that, but but its become a place of either poor, or up market rich, the middle ground people who middle incomes are having to move out because they can't afford to live here, with rents/council tax and living costs thrown in.
sp the heygate is the most atrocious dump, and there are plenty more estates like it. Sadly much of the housing now being built for the capital is not remotely affordable, irrespective of what the idiot politicians say.