This document discusses challenges in making lasting transformational change through service design projects in public services. It describes work done by ThePublicOffice with Essex County Council to rethink early years services as a case study. Three key challenges are identified: 1) Energy and ideas from projects often dissipate when projects end before changes are embedded in the system and culture. 2) Projects can be isolated, short-term, or at the edge of mainstream systems. 3) New approaches fail to take root against prevailing systems and cultures that squash new ideas. The document calls for addressing underlying system conditions to enable service design to drive sustained change through skills, methods, and supporting transformation of the wider system and culture.