If the building regulations say fireproof materials are required in a type of building, there is an absolute obligation on whoever commissions the building to specify such materials.

If fireproof have been specified when the plans are approved, there is an absolute obligation on the builder to ensure that that is what is installed. Failure to do so is criminally irresponsible.

Somewhere it went badly wrong on a national scale. If all the people who must have been responsible get what they deserve we'll need some new prisons. I suggest we adapt a few of those tower blocks to provide the needed room.
........
Relying on tower blocks to provide mass housing was crazy. They suit some people, but not many. Harlow where I live was part of the wartime rebuilding and slum clearance programme Jim mentions, one of New Towns. Homes for about 60,000 people, with seven modest sized tower blocks to allow for people who might prefer that, and the rest of us in small houses. And it works well still, though it's been ground down a bit by changes outside our control.

I hope when Labour comes to power under Corbyn that that is a model of social housing we see once again, in the spirit of the government of 1945.