Hi Clare,
Just leaving you a few good sites that contain information and resources that may be of some help to you at this time...

http://www.autism.org.uk/about-autism.aspx
Autistic Society UK

Overview of Nonverbal Learning Disability - Leslie Packer TSPlus

Helping your child with Non Verbal Learning Disability - from Canada

http://www.nldontheweb.org/home.html

http://www.tonyattwood.com.au/
Tony Attwood - Asperger's Syndrome