Public Health Nursing Marget Engagement Event Public Health Nursing (PHN) services play a key role in improving the health and wellbeing of children, young people and families and reducing health inequalities. Through health visiting, school nursing and targeted interventions, PHN services provide prevention, early help and support at key stages of life, promoting healthy development, wellbeing and safeguarding in South Gloucestershire while helping to identify and respond to emerging needs at the earliest opportunity.