It took me almost 2 years to get an autism diagnosis, I was waiting 6 months for an initial appointment, I waited 8 months for an ADOS assessment after that (which was then postponed because of the queen's funeral) so I then had to wait another month after that, and then I had to wait another month to actually receive a diagnosis.
It doesn't surprise me honestly, and I know many others have had to wait longer. Most of the people I know went private because it was so difficult to get a diagnosis on the NHS.