It would go some way to sorting out the unfairness of a system where averagely bright children of middle class families stand a better chance of getting an excellent education than the very bright children of working class families.
It depends what your definitions of middle class and working class are. If you're referring to income, with middle class people earning more than working class, then based on experience I would say it was in fact easier for low income families to access good independent schools via bursaries, whereas people earning just over the cut off limit for these have no chance of being able to afford to go there because all their income is already accounted for with mortgage, bills, etc. I am definitely middle class, with four children, and it is only the youngest one that we have been able to send to an independent school because I was able to return to work once he reached secondary age. As we had managed without my income for so long it was feasible to spend most of it on his school fees.