Under UK law, a bladed article is any object that has a blade or a sharp point, and under Section 139 of the Criminal Justice Act 1988 it is a criminal offence to carry one in a public place in England and Wales without a good reason or lawful authority. A conviction can bring up to four years in prison. The rules reach further than most people expect, and once the prosecution shows you had the item, it falls to you to prove your reason was legitimate.
What Counts as a Bladed Article
The definition is deliberately wide. If an object has a blade or comes to a sharp point, it qualifies. Kitchen knives, craft knives, axes, chisels, and box cutters all fall within it. So does anything with a sharp point, even if it was never designed as a cutting tool, provided it could function as one. What matters is the physical characteristics of the object, not what the manufacturer intended.
One narrow exception exists. A folding pocketknife with a cutting edge shorter than three inches is not treated as a bladed article under Section 139, provided it does not lock open. If the blade locks into position and needs a manual release before it will fold back, courts treat the knife as a fixed-blade weapon regardless of its size. This interpretation comes from case law rather than the statute itself. In the leading cases, courts held that a folding pocketknife must be one whose blade folds back immediately by hand pressure alone, without any preliminary step to release a lock or catch. A Swiss Army knife with no locking mechanism generally qualifies. A modern folding knife with a liner lock does not.
Where the Restriction Applies
The basic offence under Section 139 applies anywhere the public has access, whether freely or on payment. Streets, parks, shopping centres, pubs, buses, trains, and car parks all count. The restriction applies even when the item is hidden inside a bag, a coat, or a vehicle.
Schools and further education premises face tighter controls under Section 139A. The prohibition covers the entire grounds, including playgrounds, sports fields, and parking areas, and it extends to offensive weapons more broadly, not only bladed articles. The maximum penalty for possession on school or college premises is the same as for public places: up to four years’ imprisonment on indictment. An additional defence is available on education premises that does not apply elsewhere: possessing the item for educational purposes. A teacher demonstrating craft techniques, for example, could rely on this defence in a way that would not be available on a public street.
Weapons Banned Outright
Some bladed weapons go beyond the carrying restrictions and are illegal to possess even in your own home. Section 141 of the Criminal Justice Act 1988 and the orders made under it prohibit a specific list, including butterfly knives, disguised knives, push daggers, swordsticks, belt-buckle knives, and stealth knives. Since September 2024, zombie-style knives and zombie-style machetes have joined that list. A zombie-style knife is defined as a bladed article with a plain cutting edge, a sharp pointed end, a blade over eight inches long, and at least one additional feature such as serrations, multiple holes, spikes, or extra sharp points.
Anyone still holding one of these weapons can surrender it to the police, but will not receive compensation and may face prosecution. Possession of a Section 141 weapon can be tried only in the Magistrates’ Court and carries a maximum of six months’ imprisonment. Carrying one in public or threatening someone with one can be tried in the Crown Court and attracts much harsher penalties.
Lawful Defences
Carrying a bladed article in a public place is not automatically criminal. The law provides a general defence of good reason or lawful authority, plus three specific defences that illustrate what Parliament had in mind.
- Work. A chef transporting knives to a restaurant, or a carpet fitter carrying a Stanley knife to a job, can rely on this. The connection must be direct and current. Leaving work tools in your car days after a job ended weakens the argument considerably.
- Religious reasons. Members of the Sikh faith who carry a Kirpan as a religious obligation fall under this defence.
- National costume. Wearing a Sgian-dubh as part of Highland dress at a formal event is a recognised example.
These three are examples, not an exhaustive list. The general good-reason defence can cover situations outside them, but the more unusual the reason, the harder it is to establish. Self-defence, on its own, is not treated as a good reason. Forgetting the item was in your bag is almost never sufficient either. Courts look at the specific circumstances: where you were going, what you were doing, and whether carrying the blade was genuinely necessary at that moment.
The Burden of Proof Falls on You
This is where the law catches people off guard. In most criminal offences, the prosecution must prove every element beyond reasonable doubt. For knife possession, the prosecution only needs to prove you had a bladed article in a public place. Once that is established, you must prove your defence on the balance of probabilities, the standard used in civil cases. If you cannot satisfy the court that your reason was genuine and sufficient, you will be convicted. Carrying a blade without being able to clearly explain why is, in practical terms, carrying one unlawfully.
Penalties for Possession
The maximum sentence for carrying a bladed article in a public place is four years’ imprisonment and a fine on conviction on indictment. In the Magistrates’ Court, the maximum custodial term is the general limit, currently 12 months in England and Wales. The same maximum applies to possession on school or further education premises under Section 139A.
Threatening With a Bladed Article
Using a blade to threaten someone is a separate and more serious offence under Section 139AA. It applies when a person has a bladed article in a public place, on school premises, or on further education premises and intentionally threatens another person in a way that would make a reasonable bystander believe there was an immediate risk of physical harm. The maximum sentence is four years’ imprisonment on indictment, the same ceiling as simple possession, but courts treat these cases far more severely in practice, and mandatory minimum sentencing provisions apply to offenders aged 16 and over with a prior relevant conviction.
Mandatory Minimums for Repeat Offenders
Repeat knife offenders face mandatory minimum custodial sentences under Section 315 of the Sentencing Act 2020. The rule applies to anyone aged 16 or over convicted of a second qualifying offence. Qualifying offences include possession in a public place under Section 139, possession on school premises under Section 139A, and threatening with a bladed article under Section 139AA.
- Adults aged 18 and over face a minimum of six months’ imprisonment.
- Youths aged 16 to 17 face a minimum four-month detention and training order.
Judges can depart from these minimums, but the threshold is steep. For offences committed on or after the relevant provision of the Police, Crime, Sentencing and Courts Act 2022 came into force, the court must impose the minimum sentence unless it finds exceptional circumstances relating to the offence, the previous offence, or the offender that justify not doing so. That leaves very little room for a non-custodial sentence on a second conviction.
Knife Crime Prevention Orders
The Offensive Weapons Act 2019 introduced knife crime prevention orders, a civil measure that police can apply for against individuals they believe pose a risk of knife-related harm. A chief officer of police, the British Transport Police, or the Ministry of Defence Police can apply for one. The orders can impose curfews, exclusion from particular areas, prohibitions on associating with specific people, bans on carrying bladed articles, and restrictions on internet use related to knife crime.
The orders are civil rather than criminal, but breaching one is a criminal offence. Courts must set their conditions so they do not conflict with the subject’s religious beliefs or interfere with their work or education schedules wherever practicable.
Buying Bladed Articles
It is an offence to sell a bladed article to anyone under 18. The Offensive Weapons Act 2019 tightened the rules around online and remote sales specifically. When a knife is sold online, by phone, or by mail order, the seller must operate an age-verification system likely to prevent purchases by under-18s. The package must be clearly marked as containing a bladed article and labelled so that it can only be handed to someone aged 18 or over on delivery. Sellers cannot deliver bladed products to lockers. For items meeting the definition of a bladed product, meaning a blade capable of causing serious cutting injury, delivery to residential premises is also restricted unless the seller can demonstrate they exercised all reasonable precautions and due diligence to prevent the item reaching someone under 18.
These rules apply to sellers and delivery companies alike. A seller who uses a third-party courier must have arrangements in place requiring the courier to verify the recipient’s age on delivery. Ordering a kitchen knife online in England and Wales now involves an age check at purchase and a face-to-face handover on delivery, rather than a simple parcel left on a doorstep.