It's through the NHS. Had a chat with my GP. My GP was very sympathetic, we're pretty much the same age, and background, and my GP was telling me how he has some of the traits too, and how when he was a kid, his parents were told not to feed him to try improve his concentration (he never actually told me if he was diagnosed or is on any treatment now though). Then we just exchanged stories about near misses regarding deadlines and exams, and what I'd tried to do about over the years, and he then wrote a letter to the hospital to get me a referral. Then it was a blood test and an ECG, and then a zoom assessment in a couple of weeks. I did look at going private, I think it's about £600 quid to be assessed, and then they hand you back to the NHS.
It's more of a focus regulation issue. They used to think that kids with ADHD wouldn't have done well in education. eg if you've gone to a good uni, and have a good job etc, you wouldn't have problems concentrating. But now they're reappraising everything. In a book I read, the author states that most people he met who didn't finish their phd write ups, have ADHD. Lockdown and working from home has screwed up a lot of people. All the strategies I developed over the years to get stuff done, don't work when I'm working from home with a toddler running around. Also getting help is more to help those around me, I'm fine with how I am, it's my wife that suffers.
I'm the same regarding the need for podcasts to do any housework. However the one trait that really rang the alarm bells for me, was when it asked in a book do you feel the need to buy a new notebook for every major project, and then abandon the notebook within a couple of pages. I have a drawer full of nearly new notebooks.