RCT of the Clinical and Cost Effectiveness of Cognitive Behaviour Therapy (CBT) Delivered Remotely Versus Treatment as Usual in Adolescents and Young Adults With Depression Who Repeatedly Self-harm

Inclusion Criteria: * \>2 self-harm episodes. * With high levels of unipolar depressive symptoms (BDI-2 score of 17 or more). * Sufficient understanding of English (spoken and written). * Ability to give informed consent Exclusion Criteria: * Clinical judgement of high level of suicide risk, other risk to self or others requiring other urgent approaches e.g. admission to mental health unit. * Other severe mental illness e.g. psychosis, bipolar disorder, substance use disorder or organic mental disorder e.g. secondary to head injury as the primary mental health problem as determined by a structured psychiatric interview (SCID). * Currently receiving structured psychological therapy