mostlyharmless I just had to answer you because I love your name! I can't decide whether you are soft and cuddly or scary and spiky!
Yes, Oxbridge had a grid system in the 70s for trying to give a fairer entrance assessment to state school children. They were placed further along the grid on the assumption - true because it was researched - that they did not have the privilege of the extra Oxbridge tuition the public school scholars had or even the experienced teachers they had. Now there is no 7th term entry, they still say they try to give state school pupils a fair attempt, knowing they don't have the same preparation.
Life will never be equal but in education we should always be equal. I am extreme. I would ban private schools . But I would make all schools perform to a very high standard or there would be sanctions. I would pay teachers a very high salary but make them perform to a very high standard. That does not mean over-working them. They would be among our cleverest graduates, even in the infants' class. Education would be something the country would be proud of and encompass the breadth of human accomplishments, so gardeners and painters/decorators would be respected as highly as brain surgeons. It sounds too good to be true but if we all did it from the beginning it would work. All the children at school would all wear any kind of standard school clothing of the type bought in chain stores, so it would not be possible to see that one child goes to the posh school with a boater and ribbon on his blazer and the other has a simple black jacket and trousers.
That would begin the equalisation of the class system!
However, the true judge of it is invisible and to do with beliefs and standards. That's another story!