Happened less dramatically at my kids school about 16 months ago, school went from good to requires improvement, the head left, some staff left, there was an interim ht for 2 terms and quite a few things about the school changed. Afternoon break for ks1 scrapped and replaced with daily golden time (bad) , rigid ks1 reading book lists enforced and books regraded, result, my dd has spent yr 2 rereading all the books she read in yr 1, as have several other kids in her class, achievement assemblies introduced on Friday afternoons when I'm at work and can't attend, very few clubs run and those that ran were subject to frequent cancellation as teachers worked on improving pupil tracking, my son's teacher has been out of the classroom so much improving things that his education is juggled between several support teachers each week and he has gone backwards, as his lovely teacher admitted, parents of teachers of this previously successful class are now in uproar and there are a pile of interminable parent / teacher meetings to sort things out.
Good luck, I'm moving my kids next year , not because of all this but because we are moving house, and can't wait to see the back of the school, it was great before ofsted decided a cohort largely consisting of summer born boys was under performing, from being relaxed and positive, the teachers are now nervous and obviously stressed.
The school has apparently received extra resources to help it improve, perhaps it will given time, but my dcs are there now and can't wait . But it wasn't actually broken prior to ofsted, now it is.