Published on 12, July, 2020
Harley Psychiatrists (one of the clinics investigated) did my online ASD assessment via the NHS.
https://www.bbc.co.uk/news/health-65534448
Thanks to everyone who replied to this thread.
What occurred with the clinic who gave me my diagnosis has obviously been unsettling but, despite some setbacks in my faith in the diagnosis, reassurances here, plus going back over the paperwork I completed and my report, have helped me a great deal.
Autism fits so neatly into my essential self and the challenges I've faced in life, that I think it's correct.