In 2003, the UK Parliament introduced a presumptive minimum sentencing scheme for the offence of murder. Schedule 21 of the Criminal Justice Act 2003 sought to achieve greater consistency in the setting of minimum terms of imprisonment, while also providing a clear directive to judges on the need to punish and deter particularly aggravating contexts of intentional lethal violence. This article critically analyses the effects of this approach to sentencing, with 10 years' hindsight, and considers whether the continued imposition of a presumptive minimum sentencing scheme is in the best interests of justice. To examine the impacts of the 2003 Act, the article draws on interviews conducted with 26 English legal practitioners. It concludes that the introduction of a sentencing guideline for murder, alongside the repeal of Schedule 21, would better align sentencing practices for murder with those of other serious offences while also arguably allowing for more proportionate sentences to be applied on an individual case-bycase basis.