The thing is a farce. I'm glad we had been told by someone to consider the process as "apply, get rejected, manual reconsideration, rejection, appeal" before my DD turned 16 as it made the impact of the application being rejected much easier on her.
She has narcolepsy with cataplexy that is very poorly controlled. For various reasons she sees 3 specialists and a mental health nurse. They all wrote reports for her application detailing the restrictions her conditions have put on her life and the care she needs. We had specialist help filling in the form because I was worried about being too used to filling in a DLA form and I know they are different. When it got to the appeal point the panel called us on the morning to say we didn't need to attend as they had read through the papers and felt there was more than enough information to grant her both components at a level we were happy with. They had asked for no extra information so purely on the basis of what the decision maker had.
It was turned down originally on the basis of the report of a barely literate physio who decided that because DD knows she may have cataplexy it is "predictably unpredictable". They also said that because she can plan journeys she didn't qualify for the mobility section. She's a smart teenage girl - she can use google, national rail enquiries and ebookers until her heart is content, but she can't go out alone because she has no idea when she's going to deck it. Not much point planning journeys you can't sodding do. They also stated that she arrived alone - lies. That she can drive - she was 16 so another lie. That she walked up a flight of stairs - lies. They also said she was "bright and alert" through the whole face-to-face and failed to mention the fact she had one cataplexy episode during the meeting.
It then took the DWP 10 weeks to actually accept the ruling of the appeal panel as they were considering appealling the appeal. I firmly believe from everything I've heard from other people in her support group that that is a tactic designed purely to make people say "I can't deal with this, forget it".