Inadmissible Bad-Character Evidence: Effective Directions May Avoid the Need to Discharge a Jury

1. Introduction

This judgment examines when the accidental introduction of prejudicial, inadmissible evidence requires a criminal jury to be discharged. Its particular focus is whether a judge undermines an instruction to disregard evidence by subsequently mentioning that evidence in the factual summing-up.

The appellant, anonymised as ZJX, challenged convictions for historic sexual offences against a child, referred to as C. During the trial, C’s mother, M, alleged that the appellant had threatened her with a knife. That allegation fell outside the evidence the parties had agreed she could give. The appellant argued that it damaged his good-character protection, improperly supported C’s credibility and created prejudice that judicial directions could not cure.

The Court of Appeal dismissed the appeal. It reaffirmed that discharge depends on a contextual assessment of necessity and trial fairness, not simply on whether inadmissible evidence has reached the jury. Although repeating the knife allegation in the summing-up was better avoided, the clear written and oral directions remained effective.

The decision applies established principles rather than announcing a new legal test. Its practical significance lies in its treatment of cumulative prejudice, the timing of corrective directions and the distinction between an imperfect summing-up and an unsafe conviction.

2. Background and Grounds of Appeal

The prosecution and defence cases

The appellant was convicted of fourteen counts and acquitted of two others following a trial at Kingston Crown Court. The indictment concerned allegations of prolonged sexual abuse, with attempted rape among the most serious charges.

The prosecution depended centrally on C’s evidence. There was also documentary evidence that she had made an earlier complaint. The appellant denied the allegations in police interview and maintained that they had been fabricated through collusion between C and M. He did not give evidence at trial; the jury received an appropriate direction about that decision.

The appellant had no previous convictions, cautions, warnings or reprimands. His good character was an agreed fact, and the judge gave a full good-character direction.

Admissible background evidence and the disputed allegation

An allegation of physical assault had initially appeared as a separate count but was removed before the jury was empanelled. Nevertheless, the defence agreed that C’s evidence of physical chastisement could remain before the jury as background to the alleged sexual offending. It was relevant to explaining how the abuse might have continued and why C might have felt unable to complain.

M’s statement contained other prejudicial material that had been removed by agreement. Despite being told about the restrictions on her evidence, she referred during examination-in-chief to the appellant lifting a knife during a marital argument. Prosecution counsel immediately interrupted her.

The defence unsuccessfully sought the jury’s discharge. During subsequent cross-examination about the alleged motive for fabrication, M repeated and expanded the knife allegation. She also gave evidence of physical chastisement of another child.

The directions and renewed application

The judge gave written and oral directions stating that the marital allegation provided no support for the prosecution case and must be ignored. She also directed the jury against treating violence as proof of sexual offending. However, while summarising M’s evidence, she briefly repeated the knife allegation.

A renewed application to discharge the jury failed. On appeal, the appellant argued:

1. The judge should have discharged the jury because the inadmissible evidence created incurable prejudice.
2. The legal directions and summing-up were materially unbalanced and unfair.

The strongest appellate submission concerned the second discharge application: repeating evidence the jury had been told to ignore allegedly undermined the corrective direction itself.

3. Summary of the Decision

The Court of Appeal held that the trial was fair and the convictions safe. Its principal conclusions were:

• The first refusal to discharge was justified. The initial knife reference was fleeting, arose in a different context from C’s allegations and did not require the trial to end.
• An immediate corrective direction was unnecessary. At that stage, intervention risked giving a few inadmissible words disproportionate prominence.
• The later directions adequately addressed the developed allegation. They expressly required the jury to disregard it and stated that it did not support the prosecution.
• Repetition in the factual summing-up did not nullify those directions. Although omission would have been preferable, the court found no resulting confusion or unfairness.
• The additional chastisement evidence added little to the existing picture. The judge’s direction against improper propensity reasoning adequately controlled its prejudicial potential.
• The summing-up was fair and balanced. Neither ground justified disturbing the convictions.

4. Precedents and Procedural Framework

Winsor v The Queen (1866) LR 1 QB 289

This authority supplied the foundational threshold: a jury may be discharged where there is a “necessity”, meaning a high degree of need. The Court of Appeal referred to that principle alongside rule 25.7 of the Criminal Procedure Rules and the relevant discussion in Archbold (paragraph 34).

The importance of this threshold is that disclosure of inadmissible evidence does not automatically terminate a trial. The judge must assess whether continuing with the existing jury remains compatible with a fair determination. Discharge is not a routine response to an evidential mistake.

Mitcham v The Queen [2009] UKPC 5

This decision provided both the substantive approach to prejudice and the appellate standard of review.

The substantive inquiry asks whether a fair-minded and informed observer, considering the facts, would perceive a real possibility or danger that the jury would be prejudiced against the defendant. The material must be assessed against the evidence as a whole, rather than in isolation.

The appellate principle recognises the trial judge’s institutional advantage. Whether to discharge is an evaluative decision within the judge’s discretion. An appellate court does not intervene merely because another response was available: it must be satisfied that the decision was wrong and caused unfairness rendering the conviction unsafe.

In this appeal, those principles supported a contextual assessment of the knife allegation, the existing admissible evidence and the corrective directions. They also required appropriate respect for the trial judge’s assessment without making that assessment immune from review.

R v Lawson [2005] EWCA Crim 84; [2007] 1 Cr App R 20

The Court of Appeal applied the four factors identified in this authority and approved in Mitcham v The Queen:

1. The important issues in the case.
2. The nature and impact of the improperly disclosed material on those issues, including the respective strengths of the prosecution and defence cases.
3. The manner and circumstances of disclosure, and the extent of any unfair prejudice.
4. Whether, and how, judicial directions or other measures can remedy the problem sufficiently to allow the trial to continue.

These factors are neither exhaustive nor equally important in every case. Here, the central issue was C’s truthfulness. The risk was that allegations of other violence would strengthen her credibility indirectly. Against that risk stood the circumstances of disclosure, the domestic-violence evidence already properly before the jury and the explicit prohibition on using the knife allegation.

The court concluded that the trial judge had correctly directed herself and considered the relevant factors in both discharge rulings.

5. Analysis of the Court’s Reasoning

A. Contextual evidence is not a licence for unrestricted character allegations

The judgment distinguishes evidence admitted to explain the alleged offending from a collateral accusation of misconduct. C’s account of physical chastisement was relevant to the alleged environment of control and delayed disclosure. Its admission had been agreed.

That agreement did not make every allegation of violence admissible. The knife allegation remained outside the agreed evidence and was treated as inadmissible throughout the appeal.

Nevertheless, the admissible background mattered when measuring the additional prejudice. The jury already had to consider allegations that the appellant was physically authoritarian. The new material therefore had to be assessed for its incremental effect, not as though it introduced violence into an otherwise entirely different case.

B. The court recognised, but rejected, the alleged chain of prejudice

The defence argument was more sophisticated than a complaint that the knife allegation made the appellant look bad. It identified a possible chain of reasoning:

1. Violence towards M might suggest a general disposition towards violence.
2. That disposition might make C’s allegations of physical mistreatment appear more credible.
3. Greater confidence in that part of C’s account might then influence the assessment of her sexual allegations.

The court considered that risk but found it sufficiently controlled. The knife incident arose in a different setting from the conduct described by C, and the judge expressly told the jury that it provided no support for the prosecution case.

The decision therefore does not establish that collateral violence is harmless whenever violence already features in a trial. It holds that the particular additional prejudice was curable in the circumstances presented.

C. Timing a corrective direction requires judgment

The court approved the decision not to interrupt the trial immediately with a direction after the first, brief reference. Explaining inadmissible material can sometimes make jurors remember it more strongly. The judge also had to consider the unfinished state of M’s evidence and the risk of affecting the jury’s assessment of her prematurely.

Once cross-examination had expanded the allegation, a more detailed direction became appropriate. The judgment thus supports a proportionate response that develops with the evidence, rather than a universal rule requiring either immediate intervention or deferred directions.

D. Defence questioning affected the context but did not determine admissibility

The court observed that questioning M about her supposed motive for collusion carried a risk that she would explain the marital dispute by returning to the knife allegation. The manner in which the evidence developed was relevant to the overall assessment.

There was a possible argument that the defence attack on M could have made the evidence admissible. However, the prosecution did not pursue it. The Court of Appeal expressly proceeded on the assumption that the evidence should not have reached the jury.

This is an important limit on the decision. It does not establish that alleging fabrication automatically admits otherwise excluded misconduct evidence, nor that defence questioning removes the court’s responsibility to protect trial fairness.

E. Clear directions remained effective despite the later repetition

The corrective direction was specific. It identified the disputed marital allegation, explained that the jury was not trying that incident, and instructed them to ignore it because it provided no support for the prosecution.

The direction had been requested and agreed by defence counsel. It was delivered orally and remained available in writing. The Court of Appeal applied the usual assumption that jurors follow judicial directions unless there is very good reason to conclude otherwise.

The judge needed to address marital infidelity because it formed part of the alleged motive for fabrication. Nevertheless, the court acknowledged that repeating the knife reference was probably better avoided. Crucially, however, it distinguished that criticism from the separate question whether the repetition actually undermined the directions or rendered the trial unfair.

There was no necessity to repeat either the exclusionary direction or the good-character direction before the weekend adjournment or when the jury returned. In this case, their continuing force did not depend on renewed delivery at those particular moments.

F. Good character and restrictions on propensity reasoning worked together

The appellant’s good character remained relevant notwithstanding the allegations of misconduct before the jury. The court rejected the argument that the inadmissible evidence necessarily destroyed the benefit of the good-character direction.

The directions also expressly prevented the jury from treating physical violence as proof of sexual offending. Even if the jury accepted violence towards C, it was not to regard that finding as making the sexual offences more or less likely, or convict wholly or mainly because of violence.

Those safeguards performed different functions: the good-character direction explained the relevance of the appellant’s record, while the propensity direction constrained an impermissible route to conviction.

G. The ultimate inquiry remained safety and fairness

The court considered the combined effect of the disclosures, the summing-up and the directions rather than treating each event as an isolated technical issue. It found no cumulative unfairness.

The second ground therefore failed alongside the first. The court’s conclusion was not that the trial had been flawless, but that the identified imperfections did not compromise a fair trial or the safety of the convictions.

6. Significance and Likely Impact

The judgment provides useful guidance in trials where witnesses stray beyond agreed evidential boundaries:

• For trial judges: discharge decisions should explain the disputed issues, the additional prejudice and why directions can or cannot adequately address it.
• For advocates: cross-examination about motives for fabrication requires careful formulation where a witness holds prejudicial information excluded from the trial.
• For summings-up: evidence already excluded from consideration should ordinarily not be repeated unnecessarily. Clear written directions provide an enduring safeguard, but not permission for avoidable repetition.
• For appellate challenges: identifying an inadmissible statement or an infelicitous summary is insufficient without demonstrating why the proceedings became unfair and the conviction unsafe.

The ruling is particularly relevant to credibility-centred sexual-offence trials involving evidence of domestic control or violence. It confirms the need to distinguish legitimate explanatory context from improper reasoning that a person accused of one kind of misconduct is therefore likely to have committed another.

Its limits are equally important. It does not hold that directions always cure prejudicial evidence, that knife allegations are inherently minor, or that judges may safely repeat excluded material in every case. A more central, sustained or damaging disclosure could require a different outcome under the same established principles.

7. Complex Concepts Simplified

Discharging the jury

Ending the existing jury’s involvement before it returns a verdict. This is not itself an acquittal.

Bad-character evidence

Evidence suggesting misconduct or a disposition towards misconduct. Such evidence can cause unfair prejudice if used beyond its permitted purpose.

Curative direction

An instruction designed to prevent prejudice—for example, telling jurors to disregard an allegation completely.

Propensity reasoning

Reasoning that someone’s tendency to behave in one way makes the charged conduct more likely. The judge prohibited the particular inference from physical violence to sexual offending in this trial.

Unsafe conviction

A conviction that cannot properly stand following appellate review. An error does not automatically make a conviction unsafe; its effect matters.

Jigsaw identification

Identifying an anonymous person by combining separate pieces of information. This risk led the court to anonymise the appellant as well as protect C’s statutory anonymity.

8. Conclusion

ZJX, R. confirms that inadvertent disclosure of inadmissible bad-character evidence requires a contextual assessment, not automatic jury discharge. The decisive question is whether the trial can remain fair with appropriate safeguards.

The practical lesson is twofold: excluded allegations should not be unnecessarily repeated, but repetition does not inevitably defeat a clear direction to disregard them. Here, the directions, the evidential context and the limited additional prejudice justified continuing the trial, and the convictions remained safe.