Wrong Guideline, Right Question: Sentencing Errors Do Not Found a Miscarriage Unless the Final Sentence is Excessive

1. Introduction

This appeal arose following a reference by the Scottish Criminal Cases Review Commission (“the Commission”) in the case of Ly Quang Huynh (appellant) against His Majesty’s Advocate (respondent). The Commission referred the case on the basis that there may have been a miscarriage of justice in sentencing, after the appellant had been refused leave to appeal at both first and second sift.

The appellant had pled guilty in the High Court at Edinburgh to two charges of being concerned in the supplying of cannabis (Misuse of Drugs Act 1971, section 4(3)(b)), committed about nine months apart:

  • Charge 1 (2 November 2020, M74): recovery of 29kg of cannabis from a taxi; appellant’s fingerprints on vacuum-sealed bags; cash found.
  • Charge 2 (28 July 2021, Glasgow flat/vehicle): recovery of 26.178kg in the flat plus 4.125kg in a vehicle, extensive paraphernalia, significant cash holdings, and fingerprint evidence linking the appellant to multiple packages and scales.

The sentencing judge used the Sentencing Council for England and Wales guideline on “Supplying or offering to supply a controlled drug/Possession of a controlled drug with intent to supply it to another” but accepted (in a supplementary report) that he had mistakenly applied the class A section rather than the class B (cannabis) section. The central issue for the appeal court was whether that error (and other asserted errors) rendered the sentence excessive and therefore a miscarriage of justice.

2. Summary of the Judgment

The Appeal Court accepted that the sentencing judge had erred by consulting the wrong part of the English guideline, but held that this did not automatically establish a miscarriage of justice. The court emphasised that the dispositive question remained whether the final sentence imposed was excessive.

Having reviewed the offending conduct, the appellant’s role, the existence of two separate offences, the appellant’s prior conviction, and Scottish appellate guidance, the court held that the cumulative sentence of 6 years and 3 months imprisonment was not excessive. The appeal was therefore refused.

The court further observed that certain additional errors (discounting for youth by arithmetic reduction; treating time on remand by reducing sentence length rather than adjusting commencement; and allowing a relatively generous discount for a plea tendered at trial in a case largely dependent on police witnesses) had all operated in the appellant’s favour, reinforcing the conclusion that the ultimate sentence could not be characterised as excessive.

3. Analysis

3.1 Precedents Cited

A. The “excessiveness” test and miscarriage of justice

  • Barnes v HM Advocate [2024] HCJAC 23, 2024 JC 364
    The Commission relied on Barnes for the appellate framework: sentencing is discretionary, and interference is justified only where the sentence is properly characterised as excessive. The court reaffirmed that identifying an error in reasoning is insufficient unless the result is excessive.
  • Beveridge v HM Advocate [2025] HCJAC 23
    Cited for the proposition that, if a miscarriage of justice is established in relation to sentence, the appeal must succeed; but the court deployed it to reinforce the governing question: was the final sentence excessive?
  • HM Advocate v Bell 1995 SCCR 244
    The Commission analysed excessiveness through the lens used in unduly lenient sentence cases (whether the sentence “fall[s] outside the range…”). While the appeal court did not reject that formulation, it insisted on a holistic assessment of the sentencing process and relevant comparators rather than a mechanistic comparison with an English guideline “starting point”.

B. Using English guidelines and the primacy of Scottish precedent

  • HM Advocate v Collins [2016] HCJAC 102, 2017 JC 99
    This case anchored the court’s hierarchy of sources: where no Scottish Sentencing Council offence-range guideline exists, the “first resort” is Scottish appellate precedent. English material may be considered, if at all, as a cross-check, and even then with care.
  • HM Advocate v Graham [2010] HCJAC 50, 2011 JC 1 and Sutherland v HM Advocate [2015] HCJAC 115, 2016 SCCR 41
    Advanced by the appellant to justify the general relevance of English guidance where offences arise under UK-wide statutes (here, the Misuse of Drugs Act 1971). The court accepted English guidelines can be useful in the absence of Scottish guidance, but stressed structural mismatches: Scottish prosecutions commonly charge “concerned in supplying” under section 4(3)(b), whereas the English guideline is directed to offences under section 4(3)(a) and section 5(3).

C. Young offenders: no arithmetical “discounting” for age

  • Hibbard v HM Advocate [2010] HCJAC 111, 2011 JC 149 and Dunn v HM Advocate [2023] HCJAC 34, 2024 JC 51
    The court held it was not appropriate to select an adult “headline” and then apply a percentage reduction for youth. The correct approach is to assess seriousness through culpability and harm, with culpability informed by the young person’s maturity and the Scottish Sentencing Council’s “Sentencing young people” guideline. The court accepted that using guideline “starting points” may make the process appear arithmetical, but the evaluation must remain individualized.
  • Owens v HM Advocate [2022] HCJAC 29, 2022 SCCR 246
    Cited to illustrate that the “Sentencing young people” guideline requires an individualized assessment and should not be applied as an abstract age-based mitigation. In this case, the appellant’s adult relationship, parental responsibilities, entrusted control of premises and quantities, and apparent managerial role signified maturity.

D. Guilty plea discount: utilitarian value

  • Gemmell v HM Advocate [2011] HCJAC 129, 2013 JC 223
    A full bench established the utilitarian rationale: the reduction depends on the practical value of the plea, is greater when tendered earlier, is never automatic, and may be token where witness anxiety is minimal (e.g., police/analysts) and the plea is late. Applying this, the court held that the sentencing judge had been over-generous in granting approximately a one-tenth reduction for a plea tendered at trial in a police-evidence case.

E. Credit for remand time: commencement date, not sentence reduction

  • HM Advocate v O'Doherty [2022] HCJAC 31, 2022 JC 253
    The judge’s approach—reducing the length of a long-term sentence to reflect prior remand—was held erroneous. The correct method is to select the appropriate sentence and adjust the notional commencement date. The error again favoured the appellant.

F. Scottish cannabis sentencing guidance and comparators

  • Lin v HM Advocate [2007] HCJAC 62, 2008 JC 142
    Treated as a key Scottish authority, providing guidance under section 118(7) of the Criminal Procedure (Scotland) Act 1995 in relation to large-scale commercial cannabis operations. The court highlighted two aspects as relevant here: (i) higher ranges are reserved for more serious cases including multiple offences and repeat offences; (ii) even “gardeners” in substantial commercial operations ordinarily attract significant custody, in part for deterrence.
  • Ketuka v HM Advocate [2025] HCJAC 25, 2025 JC 354
    Cited for the continued endorsement of Lin as relevant and apt.
  • HM Advocate v McFadyen [2012] HCJAC 73
    Used to demonstrate Scottish appellate willingness to impose substantially higher sentences where drug quantity/value and prior record justify it, and to order consecutive sentences where offending is separated in time. The court drew a parallel with the present case’s two-offence structure.
  • Morrison, Sentencing Practice (case entries: Todd v HM Advocate 1999 G1.0024, Froude v HM Advocate 1999 G1.0025.1, McGinty v HM Advocate 2000 G1.0022.1, Coe v HM Advocate 2001 G1.0025, Stewart v HM Advocate, 2002 G1.0024.1, Geddes v HM Advocate 2003 G1.0026.1, Marshall v HM Advocate 2006 G1.0026.3)
    The court treated these as offering only broad, contextual assistance due to limited detail, but they supported the proposition that Scottish sentencing has long regarded commercial cannabis supply as serious and custody-heavy, with roles such as “safe house” provision and couriering often attracting multi-year sentences.

3.2 Legal Reasoning

A. Error is not enough: the result must be excessive

The court’s central doctrinal move was to separate (i) identifying missteps in the sentencing judge’s methodology from (ii) deciding whether the sentence was excessive. Even a clear error—here, using the class A part of an English guideline—does not itself establish a miscarriage of justice. The appellate question remains: looking at all relevant circumstances “in the round”, does the ultimate sentence fall outside what could reasonably be imposed?

B. English guidelines: useful but structurally risky in Scottish “concern in supplying” cases

The court acknowledged the potential utility of English guidelines in the absence of a Scottish offence guideline, particularly for UK statutory offences. But it cautioned against literal transposition because the Scottish charging practice under section 4(3)(b) (“concerned in supplying”) may capture a wider range of conduct than the English guideline’s target offences (section 4(3)(a) supply and section 5(3) PWITS). This creates a “like-with-like” problem: a guideline built around narrower offence labels may under- or over-reflect the gravity of conduct prosecuted in Scotland.

The court also contrasted evaluative emphases: English guidelines quantify “harm” primarily by weight, whereas Scottish practice frequently places strong emphasis on value as well as quantity.

C. Two distinct offences, not one aggregated incident

A key corrective to the Commission’s approach was the court’s insistence that the case could not be treated as a single 59kg offence. There were two crimes committed nine months apart, in different circumstances, implying persistence and escalation. That mattered both to culpability (continued participation) and to structure (consecutive/cumulative sentencing logic).

D. The appellant’s role and maturity: “significant” was generous

On the facts of charge 2, the appellant appeared to exercise control over a flat used for storage/packaging/distribution, with cash, scales, notations, and communication with an incoming consignment. The court considered it generous to characterise the role as no more than “significant” within the English taxonomy, and rejected the suggestion he was at the lower end of that category. These factual findings also undermined any suggestion that youth necessarily reduced culpability in a meaningful way: the appellant’s responsibilities and entrusted control evidenced maturity.

E. Prior conviction and sentencing calibration

The appellant’s prior conviction in England for drug production was a relevant aggravating factor. The court treated this as reinforcing the appropriateness of a substantial custodial response for repeated involvement with commercial-scale drugs.

F. “Errors” that favoured the appellant

The court identified three further errors, each operating to the appellant’s benefit:

  1. Remand time: the judge reduced the sentence length rather than adjusting the commencement date (contrary to HM Advocate v O'Doherty [2022] HCJAC 31, 2022 JC 253).
  2. Youth: the judge reduced the starting point by a quasi-arithmetical exercise rather than evaluating culpability with the individualized approach required by Hibbard and Dunn.
  3. Plea discount: the judge allowed a meaningful reduction for a late plea where, under Gemmell, only a token discount would usually be justified.

These compounding pro-appellant errors helped explain why the court was not persuaded the sentence could be excessive, notwithstanding the guideline mistake.

G. Observations on sifting decisions

The court endorsed the sift judges’ focus: the task is to decide whether it is arguable that the sentence imposed was excessive, not to audit every step of reasoning. It also reiterated that, while reasons must be given for refusals under section 107 of the Criminal Procedure (Scotland) Act 1995, it will usually be unnecessary to give reasons when granting leave, and a developing practice of detailed reasons for grants (notably by some temporary judges) is generally undesirable.

3.3 Impact

  • Sentencing appeals will remain outcome-focused: this decision reinforces that appellate intervention turns on the excessiveness of the final sentence, not merely the presence of errors (even conceded errors) in methodology.
  • English guidelines are demoted to “cross-check” status: the court provided practical cautionary guidance for Scottish sentencers: start with Scottish appellate precedent and use English guidelines only carefully and contingently, mindful of offence-label and practice differences.
  • Multi-incident drug offending must be analysed as such: treating separate incidents as a single aggregated event risks underestimating culpability and misframing the sentencing exercise.
  • Reinforcement of strict approaches to plea discounts and remand credit: the judgment consolidates Gemmell and O'Doherty in the modern sentencing toolkit, signalling to sentencers and practitioners that misapplication will be noticed, though not necessarily outcome-determinative.
  • Young person sentencing remains individualized: the decision adds to the post-guideline line of authority rejecting formulaic “percentage off for youth” approaches.

4. Complex Concepts Simplified

Miscarriage of justice (sentence)
In this context, it means the sentence is legally wrong in a way that matters—typically because it is excessive. A judge can make an error, but if the final sentence still falls within a reasonable range, an appellate court may refuse the appeal.
Excessive sentence
Not a sentence the appeal court would personally have chosen, but one that falls outside the range that a reasonable sentencer could impose having regard to relevant factors.
“Concerned in supplying” (MDA section 4(3)(b))
A broad Scottish charge capturing involvement in a supply operation (e.g., storing, packaging, transporting, managing premises) even if the accused is not caught in the act of handing drugs to a buyer.
Utilitarian value of a guilty plea
The practical benefit of the plea (saving court time/resources; avoiding witness attendance/anxiety). The later the plea, and the more the case depends on professional witnesses (police/experts), the smaller that benefit tends to be—hence only a token discount in many late-plea drug cases.
Remand credit in long-term sentences
Rather than shortening the sentence, the correct practice is often to keep the sentence length appropriate to the crime and adjust the sentence’s start date (a “notional commencement date”) to reflect time already spent in custody.
Scottish precedent vs English guidelines
Scottish courts are not bound by English sentencing guidelines. Where Scottish offence-range guidance is absent, Scottish appellate decisions are the primary reference point; English guidelines may be used only as a cautious comparison tool.

5. Conclusion

The decision in Ly Quang Huynh v His Majesty’s Advocate clarifies that a sentencing judge’s error—here, consulting the wrong portion of an English guideline—does not of itself establish a miscarriage of justice. The appellate court will intervene only if, assessed in the round, the ultimate sentence is excessive.

The judgment also provides practical guidance on (i) the proper (limited) role of English sentencing guidelines as a cross-check; (ii) the need to respect the distinct breadth of Scottish “concerned in supplying” charges; (iii) individualized assessment of youth and maturity; (iv) the utilitarian foundation for guilty plea discounts; and (v) the correct method of reflecting remand time in long-term custodial sentences. Its broader significance lies in reinforcing an outcome-based appellate discipline while sharpening methodological expectations for Scottish sentencers.