First Person Plural

Founded in 1997 First Person Plural is a registered charity and one of the longest established UK organisations working specifically for and on behalf of people affected by complex dissociative identity disorders, i.e. Dissociative Identity Disorder – also known as Multiple Personality Disorder (DID/MPD), and DID-like Dissociative Disorder Not Otherwise Specified – now renamed Other Specified Dissociative Disorder (DDNOS/OSDD). It is the only UK membership charity specialising in this field. In 2014 it became a charitable incorporated organisation.
https://firstpersonplural.org.uk