Good quality midwifery care saves the lives of women and babies. Continuity of midwife carer (CMC), a key component of good quality midwifery care, results in better clinical outcomes, higher care satisfaction and enhanced caregiver experience. However, CMC uptake has tended to be small scale or transient. McInnes et al. used realist evaluation in one Scottish health board to explore implementation of CMC as part of the Scottish Government 2017 maternity plan.