(Trying to be a little less extreme...)
Jools: I completely agree with you that people from the "school from hell" who achieve ABB probably (mostly) deserve a university place more than Public or grammar people who had it easy and received coaching and a positive working environment - even if they did not need it.
Louise_1988: I agree that Jools example does not represent even the majority of failing schools but Jools has explained this.
tomcoolinguk: Where is your sense of political/socialist idealism?! I don't think parents should be obliged to send their children to a "bog standard comprehensive" (as you call it) but my point about comprehensives representing the demographics of UK society still stands. The problem in education is not due to this government failing to provide a good service but one of philosophy.
Parents seem to want "choice". Indeed, that is the slogan which both Labour and the Conservatives are vying for. The Tories want people to be able to go private or grammar and Labour want people to be able to choose good comprehensives (expanding successful schools, setting up Academies).
What most parents and pupils fail to realise is that through "choice" there becomes a divide in the education system because the middle classes want to congregate together (as do the higher classes) and the lower classes are unable/unwilling to move from their area. This is why 'ghetto schools' develop because middle class parents are willing to push their children out of areas where there are failing schools. What happens is that failing pupils are left to rot in those same failing schools.
Academies are sort of a good idea because they select pupils to have a wide spectrum of ability in the year. They also get a lot of money, supportive staff and freedom from the LEA. However, this solution is a halfway house because there are a limited number of academies and these academies are able to fiddle the selection percentages to get the best students. Those pupils not at grammars, publics or academies will be left behind in failing schools.
Of course, if the government were to make all comprehensives band-selected then people would have to travel long distances in order to balance out the ability in an area. And it is working class parents that seem to have the most problem with sending children away. Also, if all schools were banded the middle classes would become upset and send their children to grammars or public schools for elitist reasons (to distinguish themselves from the working class and their supposed 'lower intelligence').
To conclude: the problems of delivering the best education system have not been caused by this government's education policy or this government's incompetency. The reason why [grammar] and [private] schooling "is working" is because they are selective by [ability and social class] or [wallet size], respectively - and the more this is allowed as part of a meritocracy the sharper the division between the 'haves' and the 'have nots'. Plato's Republic, anyone?!