People with ADHD being denied medication to help something like extremely bad executive dysfunciton that drastically lowers quality of life.
People being able to take advantage of the system to get medication that shouldn't get it.
Do we really believe the second group is larger than the first?
I'd also like to point out that if he talked to the NHS counselor about his project before-hand, that makes it a big confounding factor in the negative diagnosis.
On a more personal level if you're interested in knowing if you have ADHD or not, anectdotally it seems quite effective to see what your reaction to adderall is. I wonder if there is some way to judge your likelihood of ADHD by reaction to medication?
For me personally it's "Now I can 'just do the dishes'" or other obligations without 1000s of other thoughts raining down on me that make doing the dishes seem pointless before addressing the 1000s of other thoughts.
However there are other days where taking medication feels like literally nothing happened and I have what feels like the same amount of challenges.