Here are some links to Organisations, Societies and Websites which I hope will be useful in finding more information and help.
SAAD – Society for the Advancement of Anaesthesia in Dentistry. Dental charity dedicated to training and use of Sedation techniques
BSCAH – British Society of Clinical and Academic Hypnosis. Organises training and registration of practitioners who use Hypnotic techniques in their field of work. Dental members have a special interest in Dental Phobia.