Some of these replies are a little deluded as to the state of things.
In the last 12 months two separate classrooms in different buildings in my school have had ceilings literally falling in, both narrowly missing the teachers in the rooms at the time. One of the offices has mould covering the wall.
Remember those temporary classrooms from the 80s you say? Yup. We still have one. It has 6 rooms that are in daily use.
No teachers? Might be a slight exaggeration but we have a number of temporary staff that were taken on from supply but are woefully under skilled and we haven't managed to recruit for the 3 vacancies we have for September so we will have non specialists teaching ks3 next year.
Yes I'm just one school. A snapshot. But you will find similar stories everywhere.
Experienced teachers moved on because they were resistant to change? Because consistency and continuity from skilled and experienced experts in their subjects is definitely a bad thing. I've been teaching for 20 years. I would like to think I know how to teach my subject inside out. Whilst there are many positives to ECTs- being full of enthusiasm, great ideas and energy - I'm also sure someone fresh from teacher training doesn't have the same depth of knowledge or understanding of how students learn as I do.