The Care Navigation intervention is a 6-month program of support for adult patients with depression and/or anxiety referred by a GP for an assessment by a psychiatrist at the Black Dog Institute (BDI) Psychiatry Services. It aims to assist participants in navigating the mental health system and implementing the treatment plan written by their BDI psychiatrist and to subsequently improve mental health outcomes. It will be offered in addition to care as usual by participants’ referring GPs, and an