This paper draws on the work of the Evidence and Insight Team, a dedicated research function presently at the Mayor's Office for Policing And Crime, previously based within the Metropolitan Police Service for over a decade. The aim of the paper is to make readers aware of the obliquely hidden data goldmine that exists within UK policing. Such data captures the decisions police make routinely, the kinds of situations police encounter and with whom. This rich data seam goes beyond crime – and should be used more outside of policing. The authors, Paul Dawson and Elizabeth A. Stanko, argue that interested academics need a better roadmap of the data in order to stimulate basic knowledge and usage. Three case studies are presented that illustrate the scope and challenges of working with such data.