How can UK and devolved governments be more effective when addressing chronic problems like inequalities or crises like climate change? The dominant story is of pessimism: policymaking is bound to a Westminster tradition of short-termism, elitism, and centralization, and reform efforts are doomed to failure. We present a more cautiously optimistic account about the prospects for a more effective government, grounded in theory-informed lessons from two decades of UK and devolved government reform efforts. We describe a potentially more innovative and less blundering state and present a coherent Positive Public Policy agenda that can help to realize this potential.