OK I've gone but worth recounting this:
My son attends a special shcool it's for the most disabled in the city (whatever category). children attend from 3-19, and parents tend to hang around once their adult children have moved on.
I was talking to a mum (now a govenor) whose daughter was at the school quite a while ago- she;s in her 40's, and she said "where on earth are all these autistic children coming from". She said when her daughter was at the school there were about 3 children with autism in the entire school, now the younger years (infants, juniors in particular) are full. DS1's class has 6 children in - all autistic- she said that was absolutely unheard of in her day.
These are not children that could have been missed (the children in ds1's class are all non verbal). There isn't anywhere else they could have gone. The local MLD school is has switched to ASD and is completely oversubscribed.
An excellent article was published in Novembr )(? end of last year anyway) 2006, in Gut journal (high quality) which gave a model to account for the increase in autoimmune conditons. It didn't mention autism, but it was the exact same model that we came up with for what happened to ds1, and is the reason we did certain things with ds2 and ds3- involves a leaky gut. DS3 has a leaky gut by the way, but we avoided potential triggers we identified and is fine.
It should concern everyone. The lifetime care cost for a child like ds1 is millions, he will require 1:1 care for the rest of his life. If numbers are increasing at the rate they appear to be that financial cost alone to society will affect all our children. Of course it will affect ds2 and ds3 more directly.