The Cost of Private ADHD Assessments The public is becoming aware of ADHD because of the celebrity appearances of Sue Perkins and Nadia Sawalha. However, the long NHS waiting periods leave some people in a dangerous situation. Some have to pay for private treatment. In the UK It is possible http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1909658