Two things about the documentary struck me.
The first is the theme park that gives all children diagnosed with ADHD a wristband giving them priority on all rides. It's hardly an incentive to good behaviour, is it?
The second was Craig, one of the youngsters featured in the programme. He clearly has serious problems:
He has no friends, has self-harmed, suffers night terrors, is aggressive and - after assaulting three school teachers - prison looks like a very real prospect if the family don't get the help they're crying out for.Yet his favourite pastime, of all things, is fishing. If that is the case, then whatever is at the root of his difficulties, it can hardly be an ability to pay attention, can it?
Incidentally, the Panorama page gives links to some recent academic studies on the subject.