From the BBC website:
If 25% of places are to be targeted at applicants from poorer areas - and in recent years, about 40% of places have gone to pupils from private schools - then that leaves 35% for everyone else.
Even the BBC muses that the losers will be ordinary pupils from ordinary backgrounds - not rich enough for private school but living in nice enough areas.
Of course merit should not be overlooked in favour of gloss when admitting students, but I think this is increasingly less the case anyway. But admitting a large specific quota of students to one of the top universities in the world strikes me as nonsensical and unfair.