Moving to the UK with a child with ASD

Hello

I am originally from the UK but at the moment I live in Central Europe. I am considering returning to the UK with my 4.5 year old autistic son. I have a couple of questions if you might be able to help Slight smile

1.) Would my son's diagnosis abroad be valid (of course with translation) for SEN support in the UK?

2.) Where are the best areas for SEN support? (Looking at London/Essex/Bournemouth)

Any advice would be greatly appreciated! Slight smile

Thank you

Sarah