The "crumbly concrete" was used in hundreds of schools and some have been shut over fears of collapses. The UK government said more than 100 schools faced closure because they contained reinforced autoclaved aerated concrete (RAAC), a material typically used in roof planks and wall panels. AdvertisementAdvertisementOther structures such as hospitals, theaters, universities and some apartment buildings are also being checked for the concrete. Why was the concrete used? According to the think-tank the Institute for Government, those cuts are linked with schools' RAAC closures.

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Persons: Matthew Byatt, RAAC, –, Chris Goodier, What's, Keir Starmer, Rishi Sunak's, NAO, Gareth Davies, Rishi Sunak Organizations: Service, Health, Safety, National Audit Office, Guardian, Financial Times, of Structural Engineers, Labour, Loughborough University, Department for Education, Institute for Government, The Times, National Health Service, European Union Locations: Wall, Silicon, Heathrow, Gatwick, Kent, Sweden, London, he's, India