OK, back...
Peachy - no meds (yet). I have been so against it, but am starting to think anything is worth a try. When he received his AS diagnosis (at 5 yrs), the Paed said she could put a ADHD diagnosis as well - she actually asked if I wanted her to write it down on his official diagnosis - but that she thought his autism was the primary issue, and the diagnosis that would draw down the most support. We were offered ritalin, but I refused. I am willing to rethink it, now, though, Actually, his Psych thinks a reassessment and diagnosis at some stage might be beneficial, to look a what his other issues are.
Polkagirls, thank you
. I am quite worried about getting SS involved. Without giving too much away about myself, I work in partnership with SS in my every day job and I have very little faith in their ability to provide the right support in our case.
Thanks for the hugs Chipping 
bochead, thanks for taking the time to give me such a detailed reply. I appreciate it more than you could know.
I will definitely look at the training courses at ambitious about autism. Ditto the restraint courses. The school are all trained in restraint techniques, but I hadn't ever thought that we might need some training, too! Doh! He is a huge boy for his age - the size of most 11 yr olds - so this will be very helpful when he becomes physical.
He hasnt had a full sensory assessment, no - just the usual OT assessments leading up to diagnosis, which didnt really come up with anything. How could I find out about someone who would do this well?
CAMHS in our area is pretty useless too. His school is on the edge of two boroughs, so they have referred us to CAMHS in another borough, but to a centre with specialism in ASD. Initial signs are encouraging - the Psych is a lovely woman and seeks advice when she feels she is out of her depth, rather than pretending to be God, which the previous Psych did. She has also got an Ed Psych involved, who is working with the school, which is a miracle, seeing as the Ed psych in our borough has seen DS precisely once in 3 years. It is early days yet, I suppose....
I dont know about the GAPS diet? Could you explain more?
He has always slept 12 hours at night, but in the last few weeks he has started to refuse to go to bed and isn't going to sleep until 10 or 11pm. He is exhausted in the morning, though, so I know this isnt good for him. It is also affecting m ylfe badly, as the evenings were the only time I had to unwind and get some perspective, and are now spent trying to get him to sleep.
Re: his school - his unit is atached to a MS school and is for Autism & Speech, Language and Communication difficulties. He is by far the most extreme in terms of behaviour, but also by far the most able (reading appropriate for Year 8, Maths level at Year 6 levels). We were very happy with the provision in the first year, but there have been staff changes and we are no longer happy with it. They are completely out of their depth and there seems to be no therapuetc approach at all.
There are two other ASD units in our borough and I visited and hated both of them. They werent in any way appropriate for children with AS and I have no idea where to start to change his school place. I despair of any school being the right fit for him 
Finally, on the issue of our attitude towards him, I would say I am on the firm end of liberal, DH is more firm. I have tried both approaches over the years, and neither works
. If you are very firm he just rises to the authority and challenges it. Believe e, he will pursue getting his own way for hours and hours without deviating from it, no matter how firm we are. The school have this problem, too. If I am liberal, he takes the piss, to be frank. I feel we have been extra careful to be consistent with him for the last year or so, and work with the school so the strategies are the same, but his behaviour hasn't improved at all and he seems unhappy a lot of the time.
OK, I've waffled on enough. Back later! And many thanks to all who replied. It feels good to know there are at least some people out there who care.