Recommendations for private testing

Hello everyone.

It's my first time posting here. I've been reading posts and have found them so helpful I thought I would try to reach out for both myself and my son.

To cut a long story short, I think that I may be autistic. (I've scored 39/50 on the AQ test.) I also wonder whether my son, age 13, may be on the spectrum.

I feel an urgency to getting a diagnosis because my son is suffering from mental health issues, and I worry that the NHS mental health team he's being referred to may not see the full picture.

Does anyone have any recommendations for private assessments? A Google search brings up so many results, I'm overwhelmed. 

Thank you.