The Southwest London School Effectiveness Partnership (SWLSEP) is a supportive and collaborative arrangement among the London boroughs of Merton, Kingston, Richmond, Sutton, Wandsworth and Croydon. This partnership allows these partnering local authorities to gain strength and increase their effectiveness, by sharing their capacity, supporting each other's work and identifying and developing innovative solutions together.

Merton plays a leading role in SWLSEP, including a National College accredited governance group and a succession planning group with 8 years of supporting both middle leaders and senior leaders into next steps promotions and headships.