Systematic reviews (e.g. Sandall et al. 2015) have demonstrated a link between midwifery-led continuity of care models and improved Clinical, Psychosocial and Organisational (CPO) outcomes, including preterm birth and breastfeeding rates. However, the underlying causal mechanisms within these models are not understood, and trial reports rarely detail all the relevant contextual factors for the intervention and control groups. This pilot study will test the use of focus groups with service users and providers across NHS...