High Rate Mobility (DLA) and Mental Impairment

Can someone point me in the direction of detailed guidance regarding claiming the High Rate Mobility Component of DLA (for an adult) with no physical difficulties but severe mental impairment. (I've already read the advice in the guide.)

Hi I have just been succseful in winning an appeal for the high rate mobility for my Disabled son who is not physically disabled, I had to tell them everything as to why he should get it, ie he cannot cross the road alone,( danger) he cannot find his way home and would get lost, the onuse is to prove that he cannot be out alone for his own safety, and he behaves badly if confronted, that he went to a special school, they tried to say he had an normal school life? a special school is not a normal schooling, he has to be getting the higher rate of care, they asked if he needed restraingin? I said yes but not he way they think (Handcuffes) he needed to be led away which is still a form of restrain, they still refused, but I went on to a \appeal \tribunal and was able to explain a whole lot better, as I had asked for somebody with a knowledge of disabilities on the Panel, which there was
and I won so do not give up keep going tell them everything even if it hurts you to say some things, after all the things our young ones do everyday are the thinks we just put up with instead of saying
good luck :