[ToddBonzalez]

I assume you're looking for a diagnosis as an adult?

A diagnosis from a private clinic is approx. £400 (that's what I paid anyway).

You fill out a screening test in advance of a meeting with a psychiatrist.

If the psychiatrist diagnoses you with ADHD, they can initiate medication (as long as you're suitable) and once they've arrived at the correct dose for you, they will usually hand the prescribing over to your GP.

Hope this helps...