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For some disabilities most certainly there would need to be reports from the GP, maybe hospital consultants also. With this condition, the person is usually physically very fit, and pretty long lived actually. He never goes to the GP except once for a chest infection and once for a bad back!! I am pretty sure though they would apply to the GP to make sure they aren't lying about the fact that he does have this condition. They would be reluctant to ask the GP for a report because there would be very little he could put in it and would probably charge £20+ for it.
The whole thing is fairly ridiculous actually. People with this condition cannot normally read, write, manage money or work out how to get from a to b by themselves. They most certainly cannot fill out a form of this kind. And the fact that he has been determined as disabled already, and the condition he has does not change, what he could not do at 18, he cannot do now, and will not be able to do should he live to be 90.
There is a very distinct difference between physical disability where the person is in possession of their mental faculties, and a condition like this where there is severe learning disability and issues with communication and interaction with others.
We have had to stress this very firmly on the form, the words are his Mother's words, based on her knowledge of him as her son. He simply could not put the words together even verbally.
They have not had this to do before, other than when he was 18, Mencap were involved and my friend was a good deal more capable then than she is now.
However, progress is being made. The fragileX.org document was very useful in leading us as to what to think about when filling in this form. One of the major issues is that he doesn't ever have to do things that he can't do, because he never has to, so on the face of it, doesn't seem too bad, at a very basic level. Dig deeper though, and get to know him and the disability becomes very apparent. We can see depths because we know him that others can't. I have tried to stress this to her, this is about how he would appear to an assessor who doesn't know him.
The things he can do, physical things like cleaning, looking after himself with bathing, dressing etc. he is very good at and needs no help, although you could argue that he can only do this because the materials to do it are provided by someone else. It all sounds quite nit picking but they recommend mentioning this.
For me, as the person tasked with this, although voluntarily, I'm not under any kind of pressure, it's nice to know there are people out there who are willing to answer questions and provide links which might help.