R v Mason Knight

For a Category A1 offence under the applicable Sentencing Guideline, the court may assess whether the factors placing the offence in that category are extreme and justify a sentence above the guideline range. That is not double counting. Multiple culpability factors are not required. A sentencing judge need not quantify mitigation by stating a counterfactual sentence or an exact reduction. The appellate question is whether the sentence is unreasonably long so as to show inadequate weight was given to mitigation. In serious knife crime, deterrence may inform the custodial term even where an extended sentence and substantial custody already have a deterrent effect.

Mason Knight pleaded guilty in the Crown Court at Nottingham to wounding with intent, possessing a bladed article in a public place, and two thefts arising from an incident in which he stabbed a passenger in the leg with a machete and took jewellery from the occupants of a car. The injury led to an amputation through the knee.

HHJ Rafferty KC imposed an extended sentence of 19 years, comprising 14 years’ custody and a five-year extended licence period. The appellant obtained leave to appeal on the ground that the custodial term was manifestly excessive. He did not challenge the findings that he was dangerous or that an extended sentence was justified. The central issue was whether the pre-credit custodial term of 21 years, reduced to 14 years for the early guilty plea, was excessive in light of the guideline range, aggravating features and mitigation.

Disposition

The appeal against sentence was dismissed. The extended sentence of 19 years, including a 14-year custodial term and a five-year extended licence period, remained in force.

1. Category A1 assessment. The offence under count 4 was properly placed in Category A1 under the applicable Sentencing Guideline. The guideline range was 10 to 16 years, with a 12-year starting point. It was permissible to consider whether the factors which placed the offence in Category A1 were extreme and justified a sentence above the guideline range. That was an application of the guideline, not double counting.
2. Number of culpability factors. The guideline did not require multiple culpability factors before a sentence could exceed the Category A1 range. The extreme nature of one or more high-culpability factors, or the extreme impact caused by a combination of high-culpability factors, could justify a sentence above the range. The use of a highly dangerous weapon and the catastrophic, life-threatening and permanently disabling injury made a sentence materially above the range appropriate.
3. Mitigation. A sentencing judge is not required to state the sentence that would have been imposed without mitigation or to quantify the reduction attributable to mitigation. The proper appellate question was whether the term was unreasonably long so as to demonstrate that no, or inadequate, weight had been given to remorse, age, immaturity or other mitigating features.
4. Aggravation, totality and deterrence. The custodial term could properly reflect the previous convictions, the temporary prevention of medical assistance, intoxication, the risk to the second passenger and the associated thefts. Deterrence in the context of serious knife crime could also be taken into account, notwithstanding the deterrent effect of the extended sentence and substantial custodial term.
5. The 21-year term before credit for plea was consistent with proper weight being given to mitigation. The resulting 14-year custodial term was not manifestly excessive.

• Court of Appeal (Criminal Division): On 20 May 2026, the appeal against the custodial term was dismissed.
• Crown Court at Nottingham: On 26 August 2025, HHJ Rafferty KC imposed an extended sentence of 19 years, comprising 14 years’ custody and a five-year extended licence period.