JimJams,
I know you have said in the past that you didn't want to go down the route of special school, but I think it's best in the long run.
As you know my step-son (now 22!!!) is auti. He was diagnosed age 3, and was really pretty severe at that time (I didn't know him then, but have read the psychologists reports and so forth.
My dh gave up his job in Swindon and moved back to Nottingham, because there was an excellent special school here. SS went in there at 5, and stayed in the special unit right thru'. Throughout his school career he was always in a 1-to-2 or 1-to-3 staff to pupil environment, all the staff qualified.
By the time I met him at 12 he was quite a communicative boy. His behaviour was good, he participated in everything we did. He got (I think) 3 GCSE'S and stayed in school until he was 18.
Now he lives in a sheltered accommodation unit, where he shares a flat with another young man. They largely care for themselves, cooking cleaning etc. Rob works 3 days a week, and he spent last year in college, gaining an NVQ in horticulture, and one in Use of English. A couple of months ago he bought himself an electric guitar and amp.
Sorry, it sounds like boasting, but my dh firmly believes that Rob would not have developed anything like as well without the special school environment. the 'hot-housing' has done a great deal to allow him to reach his potential. Throughout, he was happy, safe and challenged.
I hope you manage to find a place for your ds soon.
Love to you.