The current paper outlines a three-year action research project with 39 schools in one inner city local authority. A local need to improve provision for children with motor skills difficulties resulted in a team of educational psychologists (EPs) and specialist teachers developing the Manchester Motor Skills Intervention (MMSI), which is a flexible package of support for primary schools. Support provided ranged from staff training and resources aimed to improve universal provision through to motor skills groups for targeted children. A mixed method evaluation was undertaken which aimed to establish which aspects of the MMSI schools found most useful and whether the programme was sustainable. The evaluation involved interviews at the end of the two-year project and school provision audits one year after the project had ceased. Participants valued the contribution of the research team to the development of a targeted intervention programme and the provision of ongoing support, while evidence suggests that the whole-school element of the MMSI requires further development. Some barriers and facilitators to sustainability are identified and discussed. (Contains 5 tables.)