Recommended Private Adults Autism Assessors

Can anyone recommend a private ASD Assessor in North Wales or the North West please? My brother is in desperate need to understand what is wrong with him.  The community mental health service are not understanding and the waiting list is up to 2 years in north wales, with the intergrated autistism service.  

I know there is a lot of controversy about private assessments, but wondered if anyone had experienced a positive helpful assesment privatly in the area?