Across the UK, more than 214 schools have been impacted by reinforced autoclaved aerated concrete (RAAC), a lightweight building material used from the 1950s to the mid-1990s, which is now at risk of collapse

. The government has published an updated list of 234 schools and colleges in England that contain RAAC

. Reasons for closures and safety measures:

• The Government decided to close over 100 education buildings with concrete prone to collapse, requiring new safety measures to ensure student safety

• The decision follows a National Audit Office study that indicated a "very likely and critical" risk of injury or death from building collapse in schools containing RAAC

• Some schools are implementing "mitigations" such as closing certain buildings

• In some instances, only a section of the school building may contain RAAC, leading to the closure of specific classrooms rather than the entire school

Examples of schools affected:

• Aston Manor Academy, Birmingham No students are expected to be on the school site until at least September 11

• Ferryhill School, County Durham The start of the new school year has been delayed

• Hadleigh High School, Hadleigh, Suffolk Considering delaying its opening or only opening some areas

• Hockley Primary School, Essex

• Honywood School, Colchester, Essex Approximately 22 classrooms are expected to close immediately, with some pupils learning online and a rota system for year groups attending school

• Kingsdown School, Southend, Essex

• Mistley Norman Church of England Primary School, Essex

• Our Lady's Catholic High School, Fulwood, Lancashire Closed September 4 and 5

• Pershore High School, Pershore, Worcestershire

• Ravens Academy, Clacton-On-Sea, Essex Closed for two days after RAAC was found in a roof

• Scalby School, Scarborough, North Yorkshire

• Springfield Primary School, Chelmsford, Essex

• St Anne's Catholic Primary School, Harlow Green, Tyne and Wear Closed until September 11

• Corpus Christi Catholic primary school in Brixton

• St Thomas More Catholic Comprehensive in Eltham

• Three other schools