Autism is one of those conditions which falls between the 2 as far as service delivery is concerned.
For DLA purposes it's treated as claim on mental health grounds and those are the sections of the adult DLA claim that need to be completed.
According to NAS it's a nuerobiological condition with a physical cause.
It's not an illness or a disease - it's a lifelong benign condition.
However as it manifests itself incognitive / communication / social deficits then it becomes a 'hidden disability'.
Service providers have historicaly been those who also dealt with learning difficulties such as Social / Communication Disorder Units. Then under NHS reorganisation at the start of the last decade repsonsibility for diagnosis etc was in most areas, transferred to CAMHS, leaving most SCDUs to deal with those with below normal IQs.
CAMHS already had the clinical psychs and psychiatrists necessary to dx and treat mental health issues and were therefore seen as best placed to dx ASD and to provide any therapy that may be required. (Hmmm)
CAMHS's traditional area of expertise was psychoses and nueroses, so they didn't initally have a great deal of expertise with autism. They expected their clients to 'get better' when ASD is a life-long condition.
CAMHS generally discharge at 16. To be handed over to adult mental health services post 16 you would need to have a comorbid condition such as anxiety or OCD. Otherwise it's so long and thanks for all the fish!
What is needed is an ASD-specific service as it doesn't fit with either physical or mental health services.
NAS did a survey of all LAs a year or so ago asking them what ASD services they have. My lying bastards LA said they had a specilaist worker. When I rang up to be put in contact with them - surprise - they didn't exist.
I sincerely hope that with the number of children that are being dx's at younger ages these days, the authorities wake up and start providing ASD-specific services that the services they will need in adolesence and beyond.