Hi Cornwall Mum,
We're in a similar situation to you.
We have a son with Tourettes who failed the 11plus by 2 points. We are appealing,but not just for one school !
It's a real shame that you didn't ask for any special measures which may have helped your son. We didn't either as we didn't think about it & our son,like yours, has no statement ,but with hindsight & some good old internet searching we found that we would have been well within our rights to ask.
Isn't hindsight a wonderful thing ?!
I have no words of wisdom to offer-sorry,simply words of support. You are most definately not alone,especially as you have found your way to this site
Wishing you & your son the best of luck,