Children and young people (CYP) with long-term physical conditions (LTCs) are four times more likely to develop mental health disorders yet many cannot access Children and Young People’s Mental Health Services (CYPMHS) or evidence-based interventions. This study aimed to understand the reasons for this; presence of an LTC neurodevelopmental disorder, or service requirements. 79 CYP mental health practitioners were randomly assigned to read vignettes depicting a hypothetical referral letter for a child with a mental...