I used to work in an Adult ADHD clinic. We were constantly complaining about shitty private assessments.
It's a money-spinner. Massively so. And can be massively damaging.
Not just to the individuals but to the health service as a whole.
Our assessments took 3 hrs, thorough and MDT. We had constant daily phonecalls complaining about the waiting list but GP commissioners did not want to give more funding and were constantly requesting a crapper service so we could see more people.
We covered several areas of the country and several commissioning groups.
A few years back one of them said you're providing a gold standard service but we want a more basic one, do less thorough assessments so you can see more people.
We refused. They said we won't commission you for the next financial year, we've seen private companies doing assessments in an hour and we're going to put this out to contract.
We discharged everyone in that area then a few weeks later they realised they couldn't find a contractor that had the resources to see how many people were referred in that area.
So they crawled back. But the point is that WILL change. The waiting lists are so long that the NHS will end up going that way, they'll contract it out to a private provider who'll set up cheap NHS ADHD assessment factories where they'll do one hour assessments, not check things properly, have staff do a 2 day training course, tick some boxes and hand out powerful drugs.