Swedes, how can you be so naive?????
Firstly, as UQD has been at pains to point out,
'The balance of successful Oxbridge entrants (approx 54-46 in favour of state school) is, each year, more or less exactly in proportion to the proportion of applicants.'
(What's your source for this BTW, UQD?)
Now, if you knew nothing about state schools, you could assume that the reason for this is that the state schools are somehow holding back all the bright kids. But this would be wrong. There are 2 obvious reasons why this is wrong:
1.) There's not much point in students who do not have a mainly A grade profile applying to Oxbridge and there are statistics which clearly show that as well as having proportionately more successful applicants to Oxbridge (relative to numbers in private vs state education) private schools also have the lions share of A grade students.
2.) State schools and colleges (as any school or college) are desperate to get students into Oxbridge. Of course they are. Nothing looks better. They get the press in, they get the students to come back and visit etc etc. Many (most) also have dedicated Oxbridge programmes. My college does. We get funding for it.
So, some of the likely reasons why students do not apply to Oxbridge in as great a number as students from private schools are:
1.) There are less students who are ABLE to apply in that there are proportionately less students who have an A grade profile (NO, do not assume this is the fault of the schools. This is because so many of the A grade potential students have been creamed off by the private schools. students at private schools have already been selected by ability, by parents ability to pay, by parental support etc. If state schools only taught students who'd been selected in this way I think you'd find their number of A grades and number of Oxbridge applicants would also soar).
2.) Amazingly, some bright students choose not to apply to Oxbridge now this could be because they can't afford to, because they don't want to leave home for financial, cultural or other reasons, it could be because they find Oxbridge courses too traditional and inflexible , it could be because they are attracted by a particular course or a particular university elsewhere. I have taught students who fall into all of these categories. For example, some Asian students who had assumed that they would stay at their parents' house until they could afford to buy outright their own house. And another student who was a gifted musician and had a scholarship sort of thing with a particular university which had links to an opera group or somehting.