Morning Mick.

If you can't get anywhere with the school the attached link for the National Autism Society may come in handy regarding rights and advice......

https://www.autism.org.uk/what-we-do...on-advice-line

....... other than that have you looked into things such as sensory lighting and mood rooms to aid with his relaxation in the evenings?

They may look a bit arty farty with soft furnishings etc. but I'm told they're great. And they're not just for relaxation in itself.

The less anxious he is the more open to learning he will be, both during the evening and following day.

May be worth giving it a go on the mornings before going to school although I suppose the measure of any benefits would depend largely on how far along the autistic spectrum he is.

Also if you haven't already done so Google 'NHS Autism in Children'. Had a quick scan when I read your post and there was quite a bit there. Anyway, all of the very best to you and yours.