For those saying it's parenting, I have three children, I've parented them all the same, but only one of then has ADHD/autism. My eldest DD has two children, again, parented the same, only one is autistic.
As for those saying it's because of the massive amounts of money paid in disability benefits, please educate yourselves! It takes a lot more than diagnosis to get these benefits, they're not just handed out for the GP saying "Oh, your child has ADHD". There has to be a significant impact on daily life on the majority of days PROVEN before a penny is paid out.
I really do think it is down to more knowledge and there is still a long way to go with this, especially for girls.
Diagnosis itself is still not easy to come by though. You either go through the GP and get referred to CAHMS, which, basically, unless the child is suicidal and prepared to tell them that,don't want to know/haven't got the capacity to deal with... or you go through the school. Going through the school is hard, as in my experience, which is with girls, the kids mask well at school, so school don't see it. Then you get to see a psychiatrist.... then there's the seemingly endless forms. Finally, months later, there may be a diagnosis.
THEN you get to filling in the forms for DLA. The highest rate is £187.45 a week but an autism or ADHD diagnosis is unlikely to get that rate,that's for people who can barely move.
More likely is the minimum which is just under £30 a week. That would barely cover the cost of the jumpers my DD has to replace frequently as my GDD chews the sleeves in anxiety. It certainly doesn't cover the hours taken off work to go to yet another meeting at school to discuss issues that seem to be ongoing. It doesn't cover what some would call bribes but what the professionals involved in my GDDs life call rewards for basic things, like going in to school without fuss, or managing a whole day in class (but it's ok,at this point, she rarely manages to achieve these things).
One thing I do know for certain, there is not a parent on this earth who would say I'll keep the money and let my child continue to struggle every day if they were realistically given the choice to swap the problems their child has for a "normal" child with no issues and no DLA!