I have just received my son's DLA renewal through in a record time of 3 weeks! He has autism and ADHD. Fortunate in that he had stayed on his current award of high rate care, low rate mobility . I am trying to get high rate mobility for him as his mobility needs have got a lot worse since his last claim. DWP are trying to argue it on the basis that he does not have severe impairment of intelligence on basis he is 2 years behind his peers but that is not deemed severe enough. I have read that they should not just be looking at IQ/chronological age measures of intelligence but also at functional intelligence and that is where my DS has the severe impairment. For example , he completely fails to recognise danger and without failure will try and run straight into a road. If I ask him to look for cars he shakes his head and sometimes will say no while trying to bolt into the road! So I am going to go for a reconsideration/appeal and want to cite the relevant case law in terms of demonstrating severe impairment of intelligence in situations such as my son's. Can anyone help?