In reply to blackmountainbiker:
Since it always easier to level down than to level up probably the easiest way to eliminate the disparities would be to ban the sale of children's books, make it illegal to read or even talk to your child except to scream at them to shut up, insist all kids were called Wayne or Shaz according to gender and ban parents from talking to the brats for birth until at least their first ASBO.
Some kids will always have a head start thanks to parents who are more diligent, more engaged, wealthy enough to provide more, be it simply experiences, books or a place at Eton or better educated themselves. Others, sadly are probably doomed before they can even walk. As with so much in life the golden rule seems to be: Pick Your Parents with Care