Trouble with transitions - what should I be asking the school to do?

[Crusoe]

Any advice really welcome - thanks in advance.
My DS is undiagnosed but we suspect attachment disorder. He is currently in primary school and doing fine but struggles with big transitions. The move to his new class in September was not managed well despite my request for transition work and my warnings about what would happen if the school did nothing. The same has happened with every new school year so far.
I am desperate that next year will be better. What should I be asking the school to do? They seem to think just a quick visit to his new class and a morning with his new teacher is enough - but it's clearly not.
Have any of you experience of support around transitions that has really helped. I know ds needs more help but I don't know what.
Thanks

My 7 yr old DS also has so much trouble with transitions. And we've just moved from Canada! School day 2 drop off was a disaster. A screaming and kicking disaster. The headmistress said that tomorrow his TA and his new little budy from class would meet him in the courtyard and take him to class (so parts with me outside and early in the process). Seems like a nice idea. Can more be done?