Exclusive: Previously unpublished official data shows Raac found at 235 DfE sites, most of which are primaries

Hundreds of primary schools in England are still at risk of collapse from crumbling concrete, according to previously unpublished figures.

Official data, which the Information Commissioner’s Office (ICO) found had been wrongly withheld by the Conservative government, confirmed the presence of reinforced autoclaved aerated concrete (Raac) at 235 Department for Education (DfE) sites, most of which were understood to be primaries.