Seems like smart design, though two stairwells still seems useful too? But if the strategy is huddle in place and smoke-sealed doors, maybe not. But I have A q

Seems like smart design, though two stairwells still seems useful too? But if the strategy is huddle in place and smoke-sealed doors, maybe not. But I have A question from your PoV as a resident if London w/ more "on the ground knowledge" outside of normal media reports: What happened with Grenfell tower to go so wrong?