[KaiserPro]

Its interesting to contrast the two approaches taken by london and paris.

Barring the great fire (and I suspect there will have been similar events in paris as well) There was no one architect or style that completely flattened the victorian london.

The strand, which is now a large paris style boulevard was a semi-slum/porn publishing district. Around the houses or parliament was a spectacularly large slum.

https://publicdomainreview.org/2016/06/29/the-secret-history... (warning Victorian porn. NSFW)

This did mean that in the 1920-40s there was a massive expansion into the "suburbs" to escape the slums, poverty and diseases of central london. This is a decline that has only really just reversed in the last 20 years. (https://en.wikipedia.org/wiki/Demography_of_London)

The crucial thing was that "social" housing was placed in every borough of the city, not just on the outskirts. The highest density of social housing is in southwark, which is opposite both the houses of parliament and the "city". I imagine its the equivalent of building ~80k houses exclusively for the poor in the 6th and 7th arrondissement