Registered with a participating GP practice (with at least six individuals coded as having severe mental illness), which refer into recruited community mental health teams, within one of the four region NHS Trusts: Birmingham and Solihull Mental Health Foundation Trust, Livewell South West (Plymouth), Cornwall Partnership NHS Foundation Trust, or Somerset Partnership NHS Foundation Trust.

 Aged ≥18 years

 A clinical diagnosis of schizophrenia, bipolar, or other types of psychoses

 Evidence for care need in relation to this diagnosis in previous 2 years (automatic for those in secondary care; assessed from notes for primary care only).

 Inability to understand English (or access translation services)

 Inability to give informed consent

 Significant need requiring ongoing secondary multi-disciplinary care (such as those meeting criteria for assertive outreach or early intervention functions, and therefore defined as higher, rather than lower, risk or need)

 Currently receiving home crisis care or care in an inpatient or secure setting

 Those excluded at the discretion of GPs, if it is felt that inclusion in this trial is not within the best interests of their patient

 Currently participating in a cognitive behavioural therapy, or a psychosocial or medicinal trial for psychosis or bipolar

 Individuals with a primary diagnosis of dementia receiving secondary care for dementia

 Individuals with a primary diagnosis of learning disability receiving care from secondary care for learning disability

 Individuals with ongoing significant and chaotic substance or alcohol misuse, making engagement with trial and intervention problematic