How Much Is a Private ADHD Assessment? If you want to decrease the length of time you wait for an ADHD assessment you can do that by paying privately. This is called your Right to Choose and it is a choice available to anyone registered with a GP in England. https://psychiatry82425.develop-blog.com/35528188/what-is-adhd-assessment-uk-private-history-of-adhd-assessment-uk-private