The Dyslexia Association provides a wide range of expert and high quality services to directly assist and improve the lives of dyslexics of all ages. They also have links and help for Dyscalculia and Dysgraphia.
The British Dyslexia Association (BDA) is the voice of dyslexic people. They also provide courses to educate people about dyslexia, dycalculia and other SpLDs.
The Down's Syndrome Association holds a wealth of knowledge about this genetic condition and helps adults and children learn about, and cope with it.