Open access. Children and young people (CYP) in the UK suffer worse health and well-being outcomes than their peers in comparable countries across a range of physical and mental health measures, including overall mortality and deaths from long-term conditions such as epilepsy, asthma and diabetes.1–6 While social determinants, in particular relatively high rates of child poverty, account for some of this mortality gap, there is growing evidence that many deaths could be prevented through more accessible and higher quality National Health Service (NHS) care.2 3