And yet more mansplaining
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There isn't any UK wide data on this. Certainly nothing from the usual suspects.
However, the universities involved in the widening access schemes (not just Oxbridge) mine the figures. Not me I should hasten to add.
And the trend seems to be, that there is no trend. Some areas which have a lot of selection, both state and private, still have high ability children in the remaining schools. Some areas with very little/non existent selection have very few high ability children. And vice versa.
There is no pattern.
So you really can't say that the existence of a super selective effects the remaining comps to a degree that there are no high ability children and thus there is no point the schools having an eye on highly selective universities.
Even North London which is of course a weird and wonderful place, doesn't have a predictable pattern. Some schools situated close to a selective school still have high numbers of high ability students. Some, a bit further away, don't. I would conjecture that this follows all manner of other patterns, including the immigrant population and where they come from.
Some colleagues feel that our energies and resources are best served by targeting those schools with reasonably high concentration of high ability pupils. Others feel that there will always be some high ability pupils in every school, so each is deserving of attention.
Interestingly, when we look back at the schools we visit, the reaction we receive from schools and our assessment of how much effort they're making does not correlate to the concentration of high ability pupils.
Imperial for example, have done some great outreach work, including some schools in the most deprived areas of London, with very low concentration of high ability students.
I too have built a great relationship with some schools who actively want to improve their systems of dealing with their high ability pupils. It's a complete pleasure doing business with them.