Well after meeting the HT at the potential new school, yesterday I met the SENCO/Inclusion manager!!
Wow, she knew exactly what I was talking about, we discussed some strategies that could be used for Dd3 for anxiety levels.
She has a 22 yr old Ds who has AS and she said out story was almost identical to hers.
We talked about transitions and she even offered to go and see Dd3 at her current school. She said she woud take photos of Dd3's new teacher, classroom and classmates, so that she could have it over the hols.
So we are going for it, there is only one place left in year 3 so we are starting the transition straight away, well on Tuesday next week.
I am really hopeful that this will be the right thing for Dd3 all I have to do know is tell her 
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