Effective oversight of policing is crucial to ensuring that the police can maintain the confidence and consent of the public. That oversight should be accompanied by an understanding of both what is important and what is effective, both of which are enhanced by engaging with evidence. In London, through the Mayor’s Office for Policing and Crime (MOPAC), over the last 10 years there has been a move to embed evidence into priority setting and oversight. The approach has developed over the course of three Police and Crime Plans, starting with analysis of pre-defined priorities developing into a research and analysis function being asked to define the right approach to oversight and culminating in this function being embedded in the whole planning process. The introduction of public scrutiny sessions through the London Policing Board in 2023 provides the next step in the development of MOPAC’s oversight. This chapter sets out the journey over the three Police and Crime Plans, describing the increasing role of evidence and analytics in oversight. It then describes the introduction of the London Policing Board and sets out how this can bring wider perspectives and expertise into oversight, further embed an evidence-based approach, and improve transparency.