At Bigbury on Sea, South Devon
Run by Discovery Surf School
We are very pleased to announce our FREE event for autistic and disabled children is going to happen on Sunday the 30th of October from 10.30. All equipment will be provided and each child will receive a free one to one 45 minute lesson with our experienced coaches. Call/e-mail us for more details and to book your child's place. Email [email protected]
That's cut and pasted by the way - I don't work for Discovery 
I do highly recommend them though. Their Facebook page has quite a few photos from other sessions with autistic and learning disabled kids and DS1 (12, severely autistic, severe LD's) surfs with them regularly - pretty much weekly at the moment.
I know I keep posting this but there's a video of DS1 with them here vimeo.com/28348727 to give a bit of an idea.
They really are a great bunch. You don't need a wetsuit or anything - it's all provided.