Regarding parents reporting schools to Ofqual, it's hardly likely to happen, though, is it, given that those parents' children stand to gain from the gaming of the system?
I have a good friend whose DD has been set maths papers to do under exam conditions, because her mock result wasn't good. I did try to tell my friend that this wasn't really acceptable but she said it was fine, because it wasn't a compulsory task. Obviously, it wouldn't be in her interests to report the school because she wants her DD to get the best grades she can.