Essay question: 'The Coroners and Justice Act 2009 replaced an outdated and incoherent common law with a statutory framework that is scarcely more principled.' Discuss.
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Introduction
The 2009 Act abolished the common law defence of provocation and enacted two partial defences—loss of control (ss 54–55) and diminished responsibility (s 52, amending the Homicide Act 1957 s 2)—with the stated aim of modernising the law, eliminating gender bias, and imposing clearer normative limits. Critics contend, however, that the reforms failed to resolve fundamental incoherencies and introduced new ambiguities. This essay argues that while the 2009 Act improved doctrinal clarity in some respects, it retained problematic features of the old law and generated fresh interpretive difficulties, particularly around the sexual infidelity exclusion and the objective standard in loss of control.
The defects of the old law
Provocation under the 1957 Act suffered from well-documented flaws. The 'reasonable man' test became unworkable after R v Camplin [1978] AC 705 and R v Smith (Morgan) [2001] 1 AC 146 allowed characteristics affecting self-control to be attributed to the reasonable person, thereby subjectivising the standard. The 'sudden and temporary' requirement disadvantaged battered women who killed after cumulative abuse (R v Ahluwalia [1992] 4 All ER 889). The focus on anger over fear led to asymmetric treatment by gender. Parliament legislated to remedy these defects.
Doctrinal improvements
The introduction of the fear trigger in s 55(3) is a significant advance. It permits defendants—disproportionately female—who kill in anticipation of serious violence to invoke the defence. The removal of the suddenness requirement in s 54(2) allows consideration of slow-burn reactions. The replacement of 'abnormality of mind' with 'abnormality of mental functioning arising from a recognised medical condition' (s 2(1) as amended) aligns the law with psychiatric classification systems and eliminates archaic language. These changes represent clear gains in coherence and fairness.
Persistent incoherencies
However, several problems remain. First, the interaction between the objective and subjective elements of loss of control remains opaque. Section 54(1)(c) imports a modified objective test but leaves the boundary between 'circumstances of the defendant' and characteristics affecting 'tolerance and self-restraint' unclear. R v Dawes [2013] EWCA Crim 322 confirmed that volatile temper and intoxication should not be attributed, but other conditions (autism, PTSD) remain in a grey area.
Second, the sexual infidelity exclusion in s 55(6)(c) was undermined almost immediately by R v Clinton [2012] EWCA Crim 2, which held that such infidelity may be considered as part of the factual context. This judicial rewriting arguably defeats Parliament's intention to exclude possessive jealousy as a mitigating factor. Commentators such as Kennefick argue that Clinton perpetuates exactly the normative deficiency the statute sought to eliminate.
Third, the normative language of s 55(4)—'circumstances of an extremely grave character' and 'justifiable sense of being seriously wronged'—delegates evaluative judgments to juries without clear guidance. Ashworth and Horder observe that such language risks inconsistency and invites juries to apply their own moral intuitions, which may be shaped by prejudice or gendered assumptions. The Court of Appeal has sought to impose threshold scrutiny (Zebedee [2012] EWCA Crim 1428), but the line between sufficient and insufficient evidence is fact-specific and unpredictable.
Fourth, the burden of proof remains on the defendant on the balance of probabilities. While this is consistent with pre-2009 practice, it is anomalous given the general principle in Woolmington that the prosecution must prove guilt. The justification—that these are excuses rather than denials of an element—is theoretically defensible but controversial.
Diminished responsibility: gains and ambiguities
The reformed diminished responsibility test is more coherent than the old. The requirement of a 'recognised medical condition' introduces an objective diagnostic anchor, reducing reliance on vague concepts of 'mental responsibility'. The three specified impairments—understanding conduct, forming rational judgment, exercising self-control—map onto cognitive and volitional deficits recognised in psychiatry. The explanation requirement in s 2(1B) ensures causal connection.
Yet ambiguities remain. R v Golds [2016] UKSC 61 clarified that 'substantially' means more than minimal, but left open how much impairment suffices. The interplay with intoxication remains complex (Dowds; Dietschmann). The ultimate questions are for the jury, but the tribunal is often in practice guided by expert agreement, raising concerns about medicalisation and the risk of de facto plea-bargaining.
Alternative approaches
Comparative jurisdictions suggest alternatives. The Model Penal Code's extreme emotional disturbance test combines subjective and objective elements more transparently. Canada's abolition of provocation reflects a judgment that such defences entrench harmful stereotypes. The Scots approach retains judicial discretion within a common law framework. Each has trade-offs, but none can claim to be definitively more principled.
Conclusion
The 2009 Act made important strides: the fear trigger, the abandonment of suddenness, and the medicalisation of diminished responsibility all improve doctrinal coherence. However, the retention of the objective test's ambiguities, the judicial dilution of the sexual infidelity exclusion in Clinton, and the evaluative vagueness of s 55(4) mean that the reformed law remains vulnerable to the charge of incoherence. As Norrie argues, partial defences to murder inevitably involve contested normative judgments; no statutory formula can eliminate discretion or the influence of social context. The 2009 Act is an improvement, but it is not the triumph of principle over pragmatism that its architects envisaged. Further reform—perhaps including a review of the mandatory life sentence for murder—may be required to achieve a truly coherent law of homicide.