Offensive Weapons Offences Under UK Law: Bans, Sentences, and Searches

Offensive weapons offences in the UK carry a maximum sentence of four years in prison for a single offence, with mandatory minimum sentences of at least six months for repeat offenders and for anyone who uses a weapon to threaten another person. The rules reach further than most people expect: some items are illegal to own even inside your own home, self-defense is not an accepted excuse for carrying a weapon in public, and police can search you without any suspicion inside a designated zone.

What the Law Treats as an Offensive Weapon

The Prevention of Crime Act 1953 defines an offensive weapon as any item made or adapted for causing injury, or intended by the person carrying it for that purpose.¹ Courts work with three practical categories, set out in R v Simpson.²

Items made to injure people, such as truncheons, butterfly knives, and knuckledusters. These count as weapons whatever you say you were doing with them.
Everyday items physically altered to cause harm, such as a bottle deliberately broken or a piece of metal sharpened to a point.
Ordinary objects carried with the intention of hurting someone. A kitchen knife, a hammer, or a cricket bat can all become offensive weapons if that is the carrier’s purpose.

The first two categories are judged on the item itself. The third turns entirely on what was going through the carrier’s mind, so prosecutors look at where you were, when, what you said, and whether the item was concealed. A screwdriver in a toolbox raises no legal issue. The same screwdriver tucked into a waistband on a night out is a different matter.

Carrying a Weapon in Public

Two separate offences cover carrying in public. Section 1 of the Prevention of Crime Act 1953 makes it illegal to have any offensive weapon with you in a public place without lawful authority or reasonable excuse.¹ Section 139 of the Criminal Justice Act 1988 separately makes it illegal to carry any bladed or sharply pointed article in a public place.³ A public place means anywhere the public has access, whether free or paid: parks, streets, shopping centres, pubs, and car parks all qualify.

The important difference between the two is intent. The 1953 Act requires proof that the item was either inherently offensive or carried with violent intent. Section 139 catches any blade or point regardless of intent. You do not have to be planning anything for a kitchen knife in your jacket to become a criminal offence under section 139.

One narrow exception applies to small folding knives. You can carry a folding pocket knife in public without needing to justify it, but only if the blade is three inches or shorter and the knife does not lock into place.⁴ A locking mechanism, even a small one, takes the knife outside the exception. Beyond that limit you need a good reason, and the burden of proving it falls on you.

Both the 1953 Act and section 139 allow a defense of good reason or lawful authority.³ The 1988 Act names three examples: use at work, religious reasons, and part of a national costume. These are illustrations rather than a closed list; courts assess each case on its facts.

Schools and further education premises are covered separately and treated at least as seriously. Section 139A of the Criminal Justice Act 1988 makes it an offence to have a bladed article or offensive weapon on land used for a school or further education institution, with a maximum sentence of four years.⁵

Self-Defense Is Not a Lawful Excuse

Carrying a weapon because you feel unsafe, expect trouble, or want protection is not a defense under UK law. The position is settled: if you leave home with an item specifically chosen to defend yourself, you are carrying it to use against a person, which is what the law prohibits. The one widely accepted personal safety product is a rape alarm, which is designed to attract attention rather than cause injury.⁶ Products marketed as legal self-defense sprays occupy uncertain ground, and police may arrest you and hold you while they check whether the product is lawful.

Weapons You Cannot Own Even at Home

Some items are banned outright. Section 141 of the Criminal Justice Act 1988 gives the Secretary of State power to designate weapon types as prohibited, with the detailed list set out in a statutory instrument.⁷ The Offensive Weapons Act 2019 expanded these prohibitions, ending the older position that let people keep certain dangerous items at home as long as they never carried them in public.

The prohibited list covers, among others:⁸

Zombie knives: blades with a cutting edge, a serrated edge, and images or words suggesting they are intended for violence.
Cyclone knives: weapons with a handle, a blade featuring two or more helical cutting edges, and a sharp point.
Knuckledusters and any weapon that incorporates one.
Butterfly knives, swordsticks, disguised knives, push daggers, blowpipes, shuriken, and various martial arts weapons.

In 2024 the government added a broader category: the zombie-style knife or machete. Unlike the original zombie knife definition, this one does not require violent imagery on the blade. It catches any bladed article with a plain cutting edge, a sharp pointed end, and a blade over eight inches long that also has at least one aggressive design feature: a serrated edge beyond a small section near the handle, multiple holes in the blade, spikes, or extra sharp points.⁹ That change closed a gap manufacturers had used, producing clearly threatening knives while omitting slogans.

Weapons over 100 years old are exempt from the private possession ban, provided they are genuine antiques.¹⁰ Modern reproductions do not qualify, even where they copy a historical design.

Government surrender and compensation schemes ran after the 2019 Act and again for the 2024 ban, but both windows have closed.¹¹¹² If you still have a prohibited item, you now face criminal liability for possession. You can hand it in at a police station, but you will not receive compensation.

Threatening Someone With a Weapon

Threatening is treated as a distinct and more serious offence than carrying. Under section 1A of the Prevention of Crime Act 1953, you commit this offence if you have an offensive weapon in a public place, intentionally threaten another person with it, and do so in a way that would make a reasonable bystander think they were at immediate risk of physical harm.¹³ The maximum sentence is four years’ imprisonment. On school and further education premises, section 139AA of the Criminal Justice Act 1988 covers the equivalent offence.¹⁴

Threatening carries a mandatory minimum custodial sentence on a first offence, with no prior conviction needed. Under section 312 of the Sentencing Act 2020, the minimums are a four-month detention and training order for 16 and 17-year-olds, and at least six months’ custody for adults.¹⁵ A court can only avoid the minimum if it finds exceptional circumstances that justify doing so.

Sentences and the Repeat Offender Rule

The maximum sentence for possessing an offensive weapon in public, carrying a bladed article in public, or committing an equivalent offence on education premises is four years’ imprisonment.² Courts can also impose an unlimited fine.

Section 315 of the Sentencing Act 2020 creates a mandatory minimum sentence for anyone aged 16 or over convicted of a second qualifying weapon offence.¹⁶ The qualifying offences are carrying an offensive weapon in public, having a bladed article in public, having either on education premises, and possessing a corrosive substance in public. If your second conviction falls under any of these, the court must impose at least:

Ages 16 to 17: a four-month detention and training order.
Ages 18 to 20: six months’ detention in a young offender institution.
Age 21 and over: six months’ imprisonment.

A court can depart from the minimum only on finding exceptional circumstances relating to the offence, the previous offence, or the offender. Within these limits, judges weigh where the offence took place, whether others were present, whether the weapon was brandished or concealed, and the offender’s prior record. First-time offenders, particularly younger defendants, are more likely to receive community orders or suspended sentences. Second convictions sharply narrow that discretion.

Selling, Marketing, and Delivering Knives

Selling a knife, blade, razor, axe, or any article with a blade or sharp point designed to injure to anyone under 18 is a criminal offence under section 141A of the Criminal Justice Act 1988.¹⁷ The rule covers both in-store and online sales. Scotland allows a limited exception for the sale of cutlery and kitchen knives to 16 and 17-year-olds.⁴

Online retailers face additional duties. Section 38 of the Offensive Weapons Act 2019 bars sellers from delivering bladed products, meaning items with a blade capable of causing a serious cutting injury, to residential premises.¹⁸ Sellers must verify age, label packaging to show it contains a bladed article, and take reasonable steps to ensure the package is handed to someone aged 18 or over. Deliveries to lockers are also prohibited. Premises used partly for business may still receive deliveries, which can apply if you work from home.

Marketing is restricted too. Under the Knives Act 1997, it is illegal to market a knife in a way that suggests it is suitable for combat or that is likely to encourage violent behaviour involving the knife as a weapon.¹⁹ Suitable for combat means suitable for use as a weapon to inflict injury. Names, descriptions, and advertising that play up a knife’s capacity to harm all fall within the Act.

When Police Can Search You

Police have two main powers to search you for weapons, and they work differently.

Section 1 of the Police and Criminal Evidence Act 1984 lets a constable search you in any public place, or any place you have ready access to other than a home, if they have reasonable grounds to suspect you are carrying a prohibited article, which includes offensive weapons.²⁰ The officer must have a specific reason to suspect you personally. If they find a weapon, they can seize it.

Section 60 of the Criminal Justice and Public Order Act 1994 operates differently. A police inspector or above can authorise blanket stop-and-search powers across a defined area for up to 24 hours if they reasonably believe serious violence may occur, has recently occurred, or that people in the area are carrying weapons without good reason.²¹ A superintendent can extend the authorisation for another 24 hours. Inside an active section 60 zone, any uniformed officer can stop and search any person or vehicle for offensive weapons without needing any suspicion about that individual. These zones are commonly activated around large public events, after stabbings, or in areas with a spike in knife crime.

1
Legislation.gov.uk. Prevention of Crime Act 1953
2
The Crown Prosecution Service. Knife and Other Weapons Offences
3
Legislation.gov.uk. Criminal Justice Act 1988 Section 139
4
GOV.UK. Selling, Buying and Carrying Knives and Weapons
5
Legislation.gov.uk. Criminal Justice Act 1988 Section 139A
6
West Yorkshire Police. Are There Any Legal Self-Defence Products That I Can Buy
7
Legislation.gov.uk. Criminal Justice Act 1988 Section 141
8
Legislation.gov.uk. The Criminal Justice Act 1988 (Offensive Weapons) Order 1988
9
GOV.UK. Public Guidance for the Zombie-Style Knives and Machetes Surrender and Compensation Scheme
10
GOV.UK. Offensive Weapons Act 2019 Statutory Guidance
11
GOV.UK. Offensive Weapons Act 2019 Surrender and Compensation Scheme
12
Ben Kinsella Trust. Home Office Compensation Plan for Zombie Knives and Machetes
13
Legislation.gov.uk. Prevention of Crime Act 1953 Section 1A
14
Legislation.gov.uk. Criminal Justice Act 1988 Section 139AA
15
Legislation.gov.uk. Sentencing Act 2020 Section 312
16
Legislation.gov.uk. Sentencing Act 2020 Section 315
17
Legislation.gov.uk. Criminal Justice Act 1988 Section 141A
18
GOV.UK. Statutory Guidance – Offensive Weapons Act 2019
19
Legislation.gov.uk. Knives Act 1997
20
Legislation.gov.uk. Police and Criminal Evidence Act 1984 Section 1
21
Legislation.gov.uk. Criminal Justice and Public Order Act 1994 Section 60