ClimateNode's Urban Flash Flooding in England project (https://climatenode.org/maps/about_UFF_maps.html…) found numerous examples of schools which had been affected by flash flooding. People don't hear about them because these events are often only reported locally.
https://www.liverpoolecho.co.uk/news/liverpool-news/staff-devastated-after-school-ruined-21537037
The UK's Chartered Institution of Water and Environmental Management published a review of surface water flood mgt yesterday which found that most local authorities don't have the staff to manage the problem, and pointed to the need for the Government to provide greater leadership.
https://www.ciwem.org/policy-reports/surface-water-management-a-review-of-the-opportunities-and-challenges