Whilst watching Top Gear??? Put my professional hat on and all that??? I will have a go but I warn you Clarkson is using a Ford Focus as a beach assault craft surrounded by marines and I have one eye on the telly.
In many EU countries teachers are recruited from the ranks of higher qualified graduates and a premium is paid for postgraduate qualifications. We don't do that - we recruit people from the middle ranks of graduates as a statistical rule, and traditionally we have been paying them as little as possible (although things have improved a little of late).
This recruitment strategy has a knock on effect to how intellectual the profession can be. There is arguably a link between scholarly, subject-based intellectualism amongst teachers and the ability to nurture highly disciplined learning in the top 10% of the population. It is these people who we are relying on to become surgeons, scientists, top civil servants, top entrepreneurs, etc etc. These people keep our standard of living high and our economy competitive.
Since the effective privatisation of many grammar schools in 1975, after the demise of the Direct Grant system, we now seem to outsource this scholarly professionalism to independent schools, and there is a subsequent tendency to educate these high flying children outside the state sector, at the expense of their parents. This is harmful for social inclusion, and perpetuates a polarised society.
My proposed remedy would be to recruit more graduates with first and 2:1 degrees, encourage study for postgraduate degrees via special premiums added to the current pay scales, give regular teacher sabbaticals to promote contact with business, industry and academe, raise per capita grants for pupils to independent school levels, and revise the National Curriculum to improve Science, Mathematics and Modern Language teaching across the board. I would also fund extended schooling generously to ensure a social net that encouraged learning amongst all social groups.
However this would all be far too expensive in the current climate, so we should just be grateful people are saving the country the bother of dealing with this problem for the time being, by educating 7% of children privately.
In the meantime we have to suffer from an inequitable system that short changes children from the lowest social groups, as indeed the grammar school system did, but to a lesser degree perhaps.