You asked
I want to know how many adults there are who are diagnosed with high functioning autism or Asperger's Syndrome and are also suffering from mental illness specifically in Norfolk and Suffolk Foundation Trust area.
We said
Thank you for your request. The requested information is not held by the Office for National Statistics (ONS). We suggest that you contact NHS Digital (formerly the Health and Social Care Information Centre) to see what information they are able to provide.
http://digital.nhs.uk/catalogue/PUB05061/esti-prev-auti-ext-07-psyc-morb-surv-rep.pdf