As a Celtic mutt, I have learned that England has The National Autistic Society (NAS), Wales has NAS and Autism Cymru, Scotland has NAS and Scottish Autism, Ireland has Autism Ireland and the Isle of Mann has Autism in Mann.
My favorite, though, is I Am Me Scotland, an autism hate-crime advocacy group. Its law-enforcement and governmental connections are "more than a wee bit amazin'."
It is interesting to me that British and Irish autism groups seem to be significantly more political than many of their American counterparts which are still stuck in research and apologia. Yes, American autists have the Autistic Self Advocacy Network and autistic leaders like Temple Grandin and Jim Sinclair, but such groups seem light years ahead of American groups.