In manslaughter by excessive self-defence, circumstances and criminality can vary enormously, and the assessment of those circumstances is very much a matter for the sentencing judge's judgment. A sentence of 10 years 6 months (before discount, approximately 12 years) for manslaughter involving 12 stab wounds with a concealed push dagger, with intent to inflict grievous bodily harm, was within the permissible range.
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