Same thing happened at a high school in Leeds in 2010. After the ceiling came down, they got a new school building by 2012, but large-scale rebuilding hasn't been able to keep up with the number of buildings reaching their end of life.
The thing is, no one built any new schools in the 1990s or early 2000s to speak of, or did the necessary major repairs, so there's now a huge backlog of buildings that haven't been fit for purpose since the 70s or 80s that need demolishing and rebuilding. Look at how many of them have dangerously-located asbestos. Or on a more minor scale, the number of schools with roof leaks when it rains. Or who still have wall-to-wall single-glazing windows that bake the kids in summer and freeze them in winter. Or are bursting at the seams so badly they're using a load of Portakabins as regular classrooms. I think the environment children learn in is so important to inspire a love of learning.
We had this aerated concrete at my old high school. We found it hilarious that we could hit the wall panels and they sounded like bongoes. None of us had any idea it was a timebomb.