zebedee I suspect everybody posting here knows those figures by heart 
But don't those figures just prove that all these schools will enable bright pupils to get A/A*. Those league tables just reflect selectivity, and some pretty small differences in academic results. In other parts of the country all these schools would be regarded as amazing, it is just that we have such a concentration it is easy to get carried away making comparisons.
What they don't tell you is which school will enable your DC to do best, some might thrive at St Paul's, some might do better at a less selective school.
And universities manifestly are not influenced by which of these schools a pupil goes to, I refer you to all the angst laden threads by parents wondering why Oxbridge admission success is not better at the most selective schools (latest was on Westminster). What they are interested in, pretty exclusively, is predicted grades /achievement at AS (not relevent in future) and for Oxbridge, convincing them on the day at interview that you are the best candidate for their places, possibly from these schools, a higher bar than if they go to local state schools (not because they favour state school applicants, just that with that level of support etc they are less likely to make allowances). So all that extra curricular, though great in teaching all sorts of life skills and providing great experiences doesn't much matter either, most students tag it on in a sentence at the end of the Personal statement (which may not get read unless there are flags to indicate disadvantage)
And as I highlighted earlier you are not comparing like with like on A level results. Some of these schools have small A level cohorts with maybe only a couple doing a particular subject, good may be for spoon feeding but not for enabling good discussions and preparing for uni life.
As Needmore highlighted upthread what you realise having gone through this to the end is that what matters is finding the school that your DC will be happy in and best able to develop the qualities of confidence, resilience etc that will enable them to take advantage of the opportunities on offer at all these schools to enable your DC to achieve their potential and realise their ambitions.