I've name changed for this as I might be needing to give more information than I'd be comfortable with.
I had written a long post about whether or not my son with Asperger's should claim DSA ("But I'm not disabled Mum!"
). He had quite a narrow view of disablity but we had a very interesting conversation about that and he knows different now. 
In writing the long post out, I've answered my own original question - he should, if he wants to.
So now I'm asking, does anyone have experience of claiming this, please? We've worked so hard on his self-esteem etc that I don't want the process to make him feel shite if we have to focus at what he can't do.
Why is it called such a horrible name too? Student Accessibility Allowance would be better.