> Here in the UK the diagnosing psychiatrist is also the one that the child must return to twice a year for a checkup at 500 pounds per visit.
This is false. All treatment is available for free on the NHS. Once they have a diagnosis children don't have to see the same psychiatrist - or any psychiatrist.
https://www.nice.org.uk/guidance/cg72/chapter/1-Guidance#dia...
> 1.3.1.1 A diagnosis of ADHD should only be made by a specialist psychiatrist, paediatrician or other appropriately qualified healthcare professional with training and expertise in the diagnosis of ADHD, on the basis of:
[...]
> 1.5.3.2 Drug treatment should only be initiated by an appropriately qualified healthcare professional with expertise in ADHD and should be based on a comprehensive assessment and diagnosis. Continued prescribing and monitoring of drug therapy may be performed by general practitioners, under shared care arrangements[7].