How Much Is a Private ADHD Assessment? If you want to cut down on the length of time you wait for an ADHD assessment, you can do so by choosing to pay privately. This option is called Your Right to Choose, and is available to all registered GPs in England. https://psychiatry-uk85897.onesmablog.com/ten-adhd-assessment-uk-private-myths-that-aren-t-always-true-70175915