Since its inception in England and Wales, the partial defence to murder of loss of control has generated a steady stream of appeals. Individually, those appeals have illuminated key aspects of the plea's operation. This paper, though, is the first to explore that operation via a systematic analysis of every loss of control appeal to date (110 cases). Using that data, the paper frames more effectively, and thus improves understanding of, a neglected phenomenon in the plea: specifically, the decision-making roles of criminal justice ‘gatekeepers’ – principally trial judges, juries and prosecutors – in governing access to loss of control. In doing so, the paper assesses how far these gatekeepers interpret the plea's requirements in a ‘civilising’ way – one which prioritises meritorious loss of control claims above those which are unmeritorious. It contends that each gatekeeper struggles to regulate loss of control in such a way. Ultimately, this diminishes the symbolic value these reforms may have had and frustrates any civilising potential of homicide law reform.
