In this trial we investigate the effectiveness and cost-effectiveness of MBT adapted for Eating disorders ( Mentalization Based Therapy for Eating Disorders ( MBT-ED ) ) compared to a standard comparison treatment , Specialist Supportive Clinical Management ( SSCM-ED ) in patients with a combination of an Eating Disorder and either a diagnosis of BPD or a history of self-harm and impulsivity in the previous 12 months .