Looking at the National Autism Society web site ( http://www.autism.org.uk/about/diagnosi ... olved.aspx ) in the United Kingdom, it describes the various roles each professional might perform including:
Quote:
Counsellor and psychotherapist
Counsellors and psychotherapists are able to talk through various issues with individuals and families. You can get counselling on the NHS through a GP referral. There are also many counsellors working in private practice. Visit the Autism Service Directory to find counsellors working privately.
It appears, then, that psychotherapists don't perform diagnostic assessments. But, I suspect that having a psychotherapist to verify and explain your characteristics to other clinicians would help the diagnostician you attend.
Good luck!