This document outlines Cambridgeshire's public mental health strategy. It aims to improve public mental health through a collaborative approach and maximizing opportunities to promote mental health and prevent mental illness. Key aspects of the strategy include taking a life course approach to promotion mental health from children to older adults, promoting physical and mental health together, developing a supportive community environment, and implementing the strategy through a multi-agency action plan. The strategy also reviews evidence on effective interventions across the life course for issues like children's mental health, social isolation, mental health and work, and integrating physical and mental health care.