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A grievous bodily harm allegation can be charged in two very different ways, and the injury alone does not decide which.
The physical facts can be identical. What separates the two offences is what the prosecution says the suspect intended.
That question is usually settled long before any jury hears the case. It is settled when the prosecutor selects the charge, on the material gathered in the first days and weeks of the investigation, and very often on what the suspect said, or did not say, in interview. I have prosecuted and defended these cases, and in my experience the choice between section 18 and section 20 shapes everything that follows: the court, the plea position, the sentencing range and, for many people, whether they lose their liberty at all.
This guide explains what grievous bodily harm means under the Offences Against the Person Act 1861 and in practice, what each offence requires, how the charge is chosen, how the courts sentence, and where the defence begins. It is for anyone who has been arrested or interviewed about a serious assault, and for families trying to understand what the charge means.
Grievous bodily harm means really serious harm. It is not defined in the 1861 Act; the meaning comes from the courts. The harm does not have to be permanent or dangerous to life, and the CPS legal guidance cites Golding [2014] EWCA Crim 889 for that point. Physical harm is not the only kind: a recognised psychiatric injury is capable of amounting to bodily harm (R v Burstow [1998] AC 147), but psychological harm in the sense of a purely emotional reaction, however distressing, is not.
Seriousness is judged in context. In Bollom [2003] EWCA Crim 2846 the Court of Appeal said that injuries which would be less serious on a healthy adult could be grievous on an elderly or unwell person, someone physically or psychiatrically vulnerable, or a very young child. The question is the effect of such harm on the person who suffered it, and whether it amounts to serious injury in their case.
The CPS charging standard gives examples of injuries that are most likely to amount to GBH: life-changing injuries, and injuries requiring significant or sustained medical treatment, such as intensive care or a blood transfusion, even where a full or near-full recovery follows. Damaged teeth or bones, extensive bruising, cuts requiring stitches and a loss of consciousness are, by contrast, given as examples most likely to amount to actual bodily harm under section 47, which also carries five years.
Both offences can also be committed by wounding, which is a separate route. A wound requires a break in the continuity of the whole skin, so the rupture of internal blood vessels, without more, is not a wound (JCC v Eisenhower [1984] QB 331). A wound can be minor and still be charged under section 20 or 18, which is why the CPS guidance requires the indictment to make clear whether wounding or GBH is alleged.
Section 20 makes it an offence to unlawfully and maliciously wound or inflict any grievous bodily harm upon another person, with or without a weapon. It is triable either way, so it can be tried in the magistrates' court or the Crown Court, and the maximum sentence is five years' imprisonment. Where the offence committed is racially or religiously aggravated, the maximum rises to seven years under section 29 of the Crime and Disorder Act 1998.
The mental element is what makes section 20 the lesser offence. "Maliciously" does not mean spite. The suspect must have intended, or foreseen, that the act might cause some harm, not necessarily serious injury (R v Savage; DPP v Parmenter [1992] 1 AC 699). A person who throws a punch foreseeing that it might cause some injury can be guilty of section 20 if the punch causes really serious harm, even though they never intended or foresaw harm of that gravity.
Section 20 cannot be attempted. An attempt requires an intention to bring about the consequence, and an intention to cause GBH is the mental element of section 18. An allegation of a failed attempt to cause serious injury is therefore charged as attempted section 18, not as attempted section 20.
Section 18, the more serious offence, makes it an offence to unlawfully and maliciously, by any means whatsoever, wound or cause any grievous bodily harm to any person with intent to do some grievous bodily harm, or with intent to resist or prevent the lawful apprehension or detainer of any person. It is triable only on indictment, so it is always tried in the Crown Court before a jury, and the maximum sentence is life imprisonment.
The prosecution must prove a specific intent. In the ordinary case that is an intention to cause really serious bodily harm. Recklessness is not enough, and nor is foresight that serious harm might result. The second limb, intent to resist or prevent lawful arrest, is narrower in practice, and it often arises where a police officer is injured. It covers a person who causes such harm while resisting their own or another person's arrest, and the CPS guidance notes it may be used where the injury amounts to GBH but an intention to cause it cannot be proved.
Where the evidence suggests the suspect intended to kill, the prosecution may charge attempted murder instead; section 18 is the most serious offence short of it. Section 18 is an offence of specific intent, so the suspect's state of mind at the moment of the act is the whole contest. Evidence that the suspect was heavily intoxicated can be relevant to whether the specific intent was formed at all, though it is no defence to section 20, which requires only the basic mental element.
| Section 20 GBH | Section 18 GBH with intent | |
|---|---|---|
| Conduct | Wound or inflict GBH | Wound or cause GBH |
| Mental element | Intended or foresaw some harm | Intended GBH (or to resist lawful arrest) |
| Where tried | Magistrates' court or Crown Court | Crown Court only |
| Maximum sentence | 5 years (7 if aggravated by racial or religious hostility) | Life imprisonment |
| Guideline range | Community order to 4 years 6 months | 2 to 16 years |
| Can it be attempted? | No | Yes |
The Crown Prosecution Service decides the charge by applying the Code for Crown Prosecutors and the CPS charging standard for offences against the person. That standard describes a two-stage approach. First, determine the level of injury: is it more than transient or trifling, is it really serious, and for GBH, is there evidence of intention or recklessness? Second, step back and, considering all the circumstances, select the charge that reflects the seriousness and extent of the offending and gives the court adequate sentencing powers.
On the critical question, the guidance is blunt. The distinction between section 18 and section 20 is the mens rea of the offence, and charge selection must address the question of recklessness and intention, explaining how the evidence directly supports the choice. It lists examples of where evidence of intention may come from:
The CPS charging standard covers all the assault offences, from common assault to the GBH offences, and the same approach applies whether one or multiple offences are alleged. Every item on that list is a factual question that can be answered with evidence, and several of them are answered, for better or worse, by the suspect. Where section 20 is a possible alternative to section 18, the CPS guidance says it is good practice for it to appear on the indictment as a separate count (Lahaye [2005] EWCA Crim 2847), with a clear explanation of why the prosecution says the suspect intended GBH and why a plea to section 20 is not acceptable.
Even where only section 18 is charged, section 6(3) of the Criminal Law Act 1967 allows a jury that acquits of the offence charged to convict of another offence whose allegations are included in it. A section 20 verdict is available on a section 18 count in the ordinary case, which is one reason the intent question is so often the real trial issue.
The Sentencing Council's assault sentencing guidelines, in force since 1 July 2021, set out the ranges for the GBH offences. The court first places the offence in a category of culpability, A, B or C, by reference to factors such as the use of a weapon, a significant degree of planning, revenge and a prolonged or persistent assault, and in a category of harm, 1, 2 or 3, from particularly grave or life-threatening injury down to all other cases of serious injury or wounding.
Assaulting an emergency worker acting in the exercise of their functions is a statutory aggravating factor for both offences under section 67 of the Sentencing Code. The court will also weigh the harm caused, the defendant's personal circumstances and any other aggravating features or mitigation. Two further points often matter. First, both offences are specified violent offences, so in the most serious cases the court must consider an extended sentence where it assesses the offender as dangerous. Second, the Sentencing Act 2026 raised the maximum term that can be suspended to three years, and created a presumption that custodial sentences of 12 months or less are suspended unless there are exceptional circumstances. Many section 20 sentences, and some at the lower end of section 18, now fall within the band where a suspended sentence must at least be considered. We explain how the new rule works in our guide to the Sentencing Act 2026 and suspended sentences.
Sentencing guidelines give a range, and a sentencing range is not a prediction. The category is a finding of fact, and the factors that place an offence in it (whether a weapon was used, whether there was planning, how long the incident lasted) are exactly the factors on which the evidence is often disputed.
The most frequent defence in a GBH allegation is self-defence, or the defence of another person or of property. A person is entitled to use force that was reasonable in the circumstances as they honestly believed them to be (Criminal Justice and Immigration Act 2008, s.76). Where self-defence is raised, the prosecution must disprove it to the criminal standard.
Other cases turn on identification, particularly in a crowded or fast-moving incident; on causation, where the injury may have resulted from something other than the act alleged, such as a fall; on whether the injury truly amounts to GBH rather than ABH; and, for section 18, on whether the specific intent can be proved at all. In a case involving more than one person, liability depends on what each person did and intended, and our guide to joint enterprise explains how that is approached since Jogee.
Most section 18 and section 20 cases begin with an arrest, often on the night, and an interview under caution within hours. That interview is where one of the CPS's listed sources of evidence of intent is created. An account given in distress, without disclosure and without advice, can supply the prosecution with the intent it needs to charge section 18. A properly prepared account, or a carefully judged decision not to answer questions, can leave the question open. We explain how that decision is approached in our guide to no comment or a prepared statement, and what to do before attending in our guide to practical steps before an interview under caution.
After interview, many suspects are released on bail or under investigation while medical evidence and CCTV are gathered. That period is not dead time. Medical evidence on the true extent of the injury, footage showing the sequence of events, and witnesses who saw what happened before the blow was struck can all be secured and put to the prosecutor. Written pre-charge representations can address both limbs of the Full Code Test, and, where the evidence of intent is weak, can address the choice between section 18 and section 20 directly, before it is made. We explain how that decision is taken in our guide to how the CPS decides to charge.
The choice of charge also decides the venue. Section 20 can be tried in the magistrates' court or the Crown Court; section 18 cannot be tried by magistrates and is sent straight to the Crown Court for trial on indictment. For section 20, the right to elect a jury, which the Courts and Tribunals Bill would remove, is covered in our guide to the Courts and Tribunals Bill.
A charge is not the end of the analysis. Where section 18 has been charged and the evidence of intent does not support it, we put that analysis to the prosecution and seek a review of the charging decision, including whether the case should proceed on section 20 only and, where the evidence does not support any charge, a discontinuance. The CPS's own guidance requires the prosecution to explain why a plea to section 20 is not an acceptable alternative, so the reasoning behind a section 18 charge is something the defence is entitled to test.
We act for individuals across England and Wales facing allegations of serious violence. Our work starts before charge, where the choice between section 18 and section 20 is still open, and it continues after charge, where we press for that choice to be reviewed. In a GBH case that means attending or advising before interview wherever we can, so that the account is given on disclosure and on advice; securing the medical evidence, footage and witness material that bear on injury and intent while they still exist; and putting that material to the decision-maker in writing before the charge is selected. For the regulated professionals and public figures we represent, an arrest for a serious assault also engages an employer, a regulator and sometimes the press, and we plan for those alongside the criminal case.
If you have been arrested or interviewed about a serious assault, or have been charged with section 18 or section 20 GBH, speak to us before the next decision is taken.
Intent, not injury: the same physical injury can support either charge. Section 20 requires that the suspect intended or foresaw that the act might cause some harm. Section 18 requires an intention to cause grievous bodily harm, or to resist lawful arrest. Section 20 is triable either way with a five-year maximum; section 18 is tried only on indictment and carries life.
Grievous bodily harm means really serious bodily harm. It does not have to be permanent or life-threatening, and it is judged in the context of the person injured, so the same injury may be grievous on a child or an elderly person and not on a healthy adult.
Yes. Actual bodily harm under section 47 is harm that is more than transient or trifling; grievous bodily harm is serious injury. Section 47 and section 20 share a five-year maximum, but the guideline ranges and the way the courts treat them differ, and section 18 is in a different category altogether.
Usually not GBH, which requires really serious bodily harm rather than minor harm. The CPS charging standard treats minor bruising and swelling as most likely to amount to common assault, and extensive or severe bruising as most likely to amount to ABH. A fractured eye socket or lasting damage to vision is a different matter.
For section 20, up to five years, with the guideline range running from a community order to 4 years 6 months. For section 18, up to life, with guideline starting points from 3 to 12 years and category ranges from 2 to 16 years.
It can. Since the Sentencing Act 2026, a custodial sentence of up to three years can be suspended, and sentences of 12 months or less are presumed to be suspended unless there are exceptional circumstances. Whether a particular sentence is suspended depends on the category, the mitigation and the court's assessment.
Not necessarily. Previous good character is mitigation, and the section 20 range includes community orders. The outcome depends on the category of culpability and harm, any aggravating features, and the strength of the mitigation. There is no guaranteed outcome, and the earlier the evidence is addressed, the more the categorisation can be informed by it. Before a sentencing hearing, we would ordinarily prepare a mitigation dossier for the judge to consider, setting out why a sentence other than immediate custody is appropriate.
Yes, in several ways. Before charge, representations can address which offence the evidence supports. After charge, the prosecution can review the charge, accept a plea to section 20, or proceed on both, and a jury can convict of section 20 on a section 18 count.
Lex Vindico Group is regulated by the Solicitors Regulation Authority. We represent individuals nationally across England and Wales in criminal, regulatory, and parallel-proceedings defence at every stage: our work starts at the pre-charge stage and continues through charge, trial and appeal.
This article is written by Akram Mula, LLM, Solicitor Advocate and CPS-approved Prosecutor, founder of Lex Vindico Group. It is general legal information about grievous bodily harm offences under the Offences Against the Person Act 1861, not legal advice on any specific case. For advice on your specific circumstances, contact our team directly.
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