Parenting programmes are effective interventions for preventing and treating conduct problems in young children. Up to 20% of children in disadvantaged areas have conduct disorder. Recent government initiatives such as targeting early years services to designated disadvantaged Flying Start areas in Wales have resulted in increased nursery-care provision for pre-schoolers, yet little has been done to equip nursery staff with effective child behaviour management strategies. The purpose of this non-randomised trial platform study was to establish the feasibility of delivery and the effectiveness of the new Incredible Years Toddler Parent Programme in supporting nursery staff in managing difficult behaviour in the nursery. The Parent Programme is a 12-session (a two-hour session/week) course for carers/parents of children aged one to three years old, which encourages carers to: establish positive relationships with children through play and child-centred activities; use praise, rewards and incentives to encourage appropriate behaviours; and use effective limit setting and clear instructions. Thirteen nursery workers were recruited from two Flying Start nurseries in Wales. Measures were completed on 28 nursery children by their parents and nursery workers, baseline and four months post-baseline, with the intervention delivered in the interim. Paired t-test analyses demonstrated statistically significant improvements (p less than 0.05) for child behaviour in the nursery and nursery staff's self-reported stress and sense of competence. No improvement in child behaviour was reported in the home. In conclusion, nursery worker training could incorporate the Incredible Years parent programme to support the staff in managing child behaviour in the nursery. The intervention should be delivered to both home and out-of-home carers to encourage consistency in child management strategies. (Contains 2 tables and 1 figure.)