The extra funding these schools have been receiving for the past 20 years appears to have made no difference to their condition. Arguably, the benefits of the decile grant have been outweighed by the costs to their reputation.
But it is easier to criticise decile funding than to suggest an alternative. If the goal is equality the obvious solutions are draconian. The law could try to stop state schools raising any funds privately and forbid children attending any state school except their nearest.
The law could try. But repressive rules seldom produce lasting solutions. Education is a service of infinite value. No matter how well the state funds them, schools will always want to do more and most parents are happy to contribute. It is healthy that they are allowed to, and that they have a choice of schools their taxes provide.
The interests of the worse-off are seldom best solved by restricting the rights of everyone. Better solutions allow everyone to benefit from the success of the better-off. The inequalities evident in education do not appear to exist in comparable state-funded services such as health.
Governments put extra money into health services in low-income areas and yet it does not carry the stigma that it does in schools. We don't read of "white flight" from general medical practices in poorer parts of the city.
Nor, of course, does it happen in services provided by the private sector. There are no "poor" supermarkets or petrol stations in lower-income communities. Their standards are much the same everywhere. The secret to equality in commercial services is a reputable brand, which provides reassurance for customers and sustenance for providers.
The way to attract patronage back to low-decile schools may be to similarly associate them with schools that are well regarded. The Government is taking a step in this direction with its cash incentive for them to form clusters under an executive principal and to share leading teachers.
Decile funding is driving away too many of the pupils poor schools most need. The answer is not to keep them captive, it is to change the image of the school. Give it a prestigious makeover, let it ask a fee and watch its roll swell with pride.