Undue Leniency in Prison-Corruption Sentencing: Disclosing an Informant’s Identity Must Be Reflected in the Aggregate Sentence (and May Justify a Marked Uplift for the Instigating Prisoner)

1. Introduction

In Winkless & Anor, R. v [2026] EWCA Crim 904, the Court of Appeal (Criminal Division) (Stuart‑Smith LJ, Cutts J and HHJ Lickley KC) determined a reference by the Solicitor General under s.36 Criminal Justice Act 1988 contending that two sentences imposed at Northampton Crown Court were unduly lenient.

The case concerned a corrupt relationship at HMP Five Wells between (i) a serving prisoner (the first respondent) and (ii) a young prison officer (the second respondent, under 21 at conviction). The offending comprised misconduct in public office (for the officer), offences involving illicit items and phones in prison, and (centrally for the reference) the disclosure of intelligence identifying a prison informant.

The key issues were (a) whether the sentencing judge unlawfully failed to give proper effect to the additional criminality and harm represented by the “informant disclosure” count, and (b) whether—applying the “unduly lenient” threshold—the Court of Appeal should increase either or both offenders’ aggregate sentences.

2. Summary of the Judgment

  • Leave to refer was granted.
  • For the prison officer, the Court held the overall sentence (3 years) was lenient but not unduly lenient; the reference was dismissed in her case.
  • The Court directed an administrative/legal correction: because she was under 21, the sentence should be recorded as detention in a young offender institution, not “imprisonment”.
  • For the prisoner, the Court held the aggregate sentence (3 years 4 months, consecutive to his existing sentence) was unduly lenient.
  • The Court quashed and substituted the sentence on the “informant disclosure” count to 5 years concurrent, producing a new total of 5 years (still consecutive to his existing sentence).

3. Factual and Procedural Context (Condensed)

The offending ran over roughly November–December 2024 and involved extensive illicit contact (thousands of communications), a sexual relationship while the officer was on duty, the introduction of drugs and phones, and the circulation of sexual videos. The “informant disclosure” conduct consisted of the officer telling the prisoner the identity of an informant and related intelligence—conduct the sentencing judge described as “extremely serious” given the risk of serious violence to suspected informants.

4. Analysis

4.1 Precedents Cited

Waddington [2015] EWCA Crim 367

The Court relied on Waddington as a benchmark illustrating how seriously prison-corruption offending is treated even where the relationship is non‑sexual and the offender is of good character. In that case, an aggregate sentence of 19 months (after plea) was upheld for misconduct in public office and conveying List B articles (phones).

McDade and Reynolds [2010] EWCA Crim 249

Via Waddington, the Court reiterated the rationale for deterrent sentencing in prison-corruption cases, adopting the well-known statement in McDade and Reynolds that a corrupt prison officer is uniquely placed to defeat prison security, undermining order and safety and harming honest staff who “will come under suspicion” and closer scrutiny.

R v Bennett [2019] EWCA Crim 762

The Court treated R v Bennett as a modern illustration of high culpability where a prison officer’s misconduct spans multiple dimensions: sexual misconduct, drugs, and critically the passing of security-sensitive information. The Court in Bennett upheld a severe sentence (6 years 6 months after plea) because the information-sharing “fundamentally undermined” prison security. That reasoning directly informed the approach here: information offences can materially aggravate prison-corruption cases beyond “contraband + improper relationship”.

4.2 Legal Reasoning

(a) The “unduly lenient” question and the Court’s methodology

A sentence may be “unduly lenient” only if it falls outside the range of sentences reasonably open to the judge. The Court’s reasoning is notable for how it addressed the practical difficulty created by the sentencing remarks: the judge did not spell out her “notional” post‑trial sentence or how she applied reductions for mitigation and guilty pleas.

The Court therefore adopted a structured evaluative approach:

  • Identify the overall seriousness of the conduct, including the distinct harm in the informant disclosure count (risk of serious violence; systemic damage to security and trust).
  • For each offender, estimate the least aggregate sentence after trial that could properly have been imposed.
  • Apply a realistic range of reductions for personal mitigation and then for guilty plea (while stressing this is not a purely mathematical exercise and must be checked by a “stand back” totality assessment).

(b) Why the informant disclosure (Count 2) mattered

The Solicitor General’s core submission—accepted in substance—was that the sentence structure treated the informant disclosure as adding no meaningful additional penalty. The Court agreed that this kind of conduct is “extremely serious” because it exposes an identified prisoner to potentially grave harm and undermines institutional security. In sentencing terms, it may require:

  • a consecutive element, or
  • a significant uplift to the lead count where concurrency is used.

The Court’s outcome illustrates that the same “missing uplift” point may yield different appellate results depending on offender-specific mitigation and overall proportionality.

(c) Divergent outcomes for the two offenders

The prison officer (under 21): Although her culpability and harm were properly categorised as “high” and the informant disclosure was “extremely serious”, the Court accepted substantial mitigation: youth, immaturity, vulnerability (including mental health features and trauma history), previous good character, and evidence consistent with being manipulated. The Court concluded that, even allowing for the need for deterrence in prison-corruption cases, the 3-year total remained within range and thus not “unduly” lenient.

The prisoner: The Court placed weight on his extensive record, his role in instigation and grooming, and the aggravating nature of corrupting a serving officer. It concluded that the least proper post‑trial aggregate sentence was about 7½–8 years, with only modest mitigation and a 25% plea discount leading to a proper minimum of about 5 years. Totality did not justify restraint because there was “no connection at all” between this offending and the offences for which he was already serving a long sentence. The original 3 years 4 months was therefore unduly lenient.

4.3 Impact

  • Sentencing practice in prison-corruption cases: The decision reinforces that information-sharing that endangers others (especially naming an informant) is not merely another factual detail; it is a distinct dimension of harm that must be visibly reflected in the aggregate sentence (by consecutivity or uplift).
  • Role differentiation: The Court’s split outcome underlines that appellate intervention will be more likely where the offender is the instigator/groomer and has significant aggravation, even if a co‑offender’s sentence is left untouched.
  • Recording/labeling for under‑21s: The judgment is a reminder that sentences for offenders under 21 should be expressed as detention in a young offender institution, not “imprisonment”, and the Court will direct correction.
  • Attorney General references: The case illustrates the Court’s pragmatic approach where sentencing remarks omit a clear “step-by-step” calculation: the appellate court may still assess leniency by identifying the minimum proper sentence and testing whether the imposed sentence falls below the permissible range.

5. Complex Concepts Simplified

  • Attorney General’s Reference (s.36 CJA 1988): A mechanism allowing the prosecution (via the Law Officers) to ask the Court of Appeal to increase certain sentences if they are unduly lenient.
  • Unduly lenient vs. lenient: A sentence can be “lenient” yet lawful. The Court intervenes only if it is outside the range of reasonable sentences open to the judge.
  • Concurrent vs. consecutive: Concurrent sentences run at the same time; consecutive sentences stack. Where multiple offences capture distinct harms, courts may use consecutivity—or a clear uplift to the lead offence—to ensure all criminality is reflected.
  • Totality: The overall sentence must be proportionate to the whole offending. Prior sentences matter, but do not automatically reduce the proper punishment for unrelated new offending.
  • Notional sentence and reductions: Courts often consider a “notional after-trial” sentence and then apply reductions for mitigation and guilty plea. Here, the Court used this as an evaluative tool while stressing it is not a rigid formula.

6. Conclusion

[2026] EWCA Crim 904 confirms that in prison-corruption cases, naming a prison informant and passing sensitive intelligence is an “extremely serious” aggravating feature that must be meaningfully reflected in the final sentence. The Court’s differentiated outcomes show that the “unduly lenient” threshold turns on offender-specific mitigation and role: substantial youth-related vulnerability may keep a short sentence within range, whereas an instigating prisoner with significant aggravation may face a marked appellate uplift, even where counts run concurrently and the overall term is consecutive to an existing sentence.