CResident,
I do understand the point you are making- I do think you make a case.
Its true there is no easy answer.
But my overarching case, based on colleague reports and my own experience is that thresholds are so low, support is diluted and schools disrupted.
So any attempts to lower numbers is a step in the right direction.
Now I get that in your case you feel this 'sweeping approach' has resulted in indirect discrimination to your child.
But you know as well as I that there are many parents would argue their 'less able' child should get this support/advantage too.
Your argument that your child should get it over and above theirs is based upon a certain measurement- the 'discrepancy'. And thats persuasive up to a point, but there are alternative models for threshold that produce a different ranking order for those applying.
So lets say I was EdSec and said right!- we use a discrepancy formula and we take the most deserving 5%- I would have a different set of angry parents vying for my blood. Do you see the problem? they would also have plausible claims for discrimination.
In a really fair world we would adjust exam scores for birthdate, post code of home address, dispraxia, dyslexia, combined parental income, gender, school OFSTED rating, ethnicity and many other factors.
and that this adjustment would be PROPORTIONAL to the degree of discrepancy or factor.
It would mean every single kid in the uk would do an exam of different length and have different grade boundaries.
this is not an argument to dismiss all AA you understand (or to deny the dyslexia issue) - Im trying to explain why many parents, teachers and children will always legitimately disagree with whatever AA/support system is in place.