Evidence from this study suggests that the implementation of NICE guidance for the definition of confirmed delay, with the 2–hour window of suspected delay without intervention, reduces the number of spontaneously labouring women who require oxytocin augmentation from approximately 40–11%.[18] This markedly reduces the numbers of women requiring intervention, and suggests that previous definitions of delay have encouraged intervention in women who were actually labouring normally. This information must inform any definitive trial.