UK Bladed Article and Knife Laws: Bans, Good Reason, Penalties

Under UK knife laws, you can carry a folding pocket knife with a cutting edge of three inches (7.62 cm) or less in public without needing to justify it. Anything else — a longer blade, a fixed blade, or a folder that locks open — is a criminal offence under Section 139 of the Criminal Justice Act 1988 unless you have a good reason or lawful authority, and the burden of proving that reason falls on you.¹ A separate category of weapons is banned outright, meaning you cannot own them even at home. Penalties run up to four years in prison, and a second knife possession conviction triggers a mandatory minimum custodial sentence.

The Folding Pocket Knife Exception

The only knife you can carry in public with no justification required is a folding pocket knife with a cutting edge that does not exceed three inches.¹ The blade must fold freely into the handle, without any mechanism that locks it open during use.

This is where people get caught out. Lock knives, where the blade clicks into position and stays open until you press a release, do not qualify. The courts settled this in Harris v DPP and confirmed it in R v Deegan. Even a blade well under three inches, if it locks, is treated the same as a fixed-blade knife and needs a good reason to carry. Many popular outdoor and utility knives are lock knives, so check the mechanism before assuming yours is a legal carry.

Knives and Weapons Banned Outright

Some weapons are illegal to possess anywhere, including inside your own home. The Offensive Weapons Act 2019 and the Criminal Justice Act 1988 together set out a long list of prohibited items.² The most commonly encountered include:

Flick knives and gravity knives, which open automatically from a closed or partially open position by pressing a button, activating a spring, or using gravity.²
Butterfly knives (balisongs), where a two-part handle splits to reveal the blade.
Disguised knives, with concealed blades designed to look like pens, combs, lipsticks, or phones.
Zombie knives. Since September 2024, the definition catches any weapon over eight inches long with a serrated edge, spikes, or more than two sharp points. The previous requirement for threatening imagery or wording was dropped.³
Cyclone or spiral knives, with two or more helical cutting edges and a sharp point.
Curved swords over 50 cm, measured in a straight line from the top of the handle to the tip.
Swordsticks, push daggers, knuckledusters, belt buckle knives, shuriken (throwing stars), telescopic truncheons, blowpipes, and various traditional martial arts chain weapons.

Narrow exemptions exist. Antique weapons over 100 years old fall outside the prohibition.² Curved swords of 50 cm or longer are exempt if made before 1954, or if made at any time using traditional hand methods. This protects genuine historical collections and handcrafted ceremonial swords.

What Counts as a “Good Reason” to Carry

If you carry anything other than a sub-three-inch non-locking folder in public, you need a defence a court would accept. Section 139 provides a general defence of “good reason or lawful authority” and lists specific categories.¹ You have to prove the reason; the prosecution does not have to disprove it.

Work

The most common defence. A chef transporting knives to a restaurant, a carpet fitter carrying a Stanley knife to a job, or a fishmonger heading to the market with filleting knives all have a clear work justification. The connection has to be direct and current. Carrying a work knife on your day off, with no job to go to, is not a good reason.

Religious and Cultural Reasons

The law specifically protects carrying a bladed article for religious reasons or as part of a national costume.¹ In practice, this most often applies to the Sikh Kirpan and the Scottish Sgian-dubh worn as part of Highland dress.

Recreational Activities

Camping, fishing, and bushcraft can justify carrying a larger knife, but there is no blanket exemption for outdoor enthusiasts. You need to show the knife is appropriate for the activity and that you are travelling to, taking part in, or returning from it. Keep the knife packed securely in a rucksack or equipment bag during transit rather than on your belt. Stopping at a petrol station on the way to a fishing trip with a sheath knife packed in your tackle bag is likely a good reason. Carrying the same knife loosely in your jacket pocket while doing your weekly shop is not.

Transporting Knives

Moving house, taking kitchen knives to be sharpened, or bringing a newly bought knife home all involve carrying blades through public space. The legislation does not spell these out, so a court decides whether your reason qualifies.⁴ Keep the item wrapped, sealed in a bag or box, and clearly being transported rather than readily accessible. Kitchen knives packed in a moving box count. A loose knife in your pocket “just in case” does not.

Where the Rules Reach: “Public Place” and Your Car

A public place is any location where the public has access or is allowed access at the time, whether or not they pay to enter.¹ That covers streets, parks, shops, pubs, stadiums, train stations, and car parks. It also covers your car. A vehicle parked on a public road or driven on a highway is treated as a public place, so leaving a knife in your glove box or boot without a good reason is an offence just as much as carrying one in your pocket.

Forgetting is not a defence. Courts have consistently held that simply forgetting a blade you left in the car after a previous legitimate use is not a good reason for possession. You need an active, current justification tied to a lawful activity.

Penalties

Sentencing has been progressively toughened, and the consequences are severe even for a first offence.

Carrying a bladed article in public under Section 139 carries up to six months’ imprisonment on summary conviction in a magistrates’ court, or up to four years on indictment in the Crown Court, plus an unlimited fine in either case.¹ Many first-time offenders receive a community order or suspended sentence, but the statutory maximum leaves room for far harsher punishment depending on circumstances.

Possessing a knife on school or further education premises is a separate offence under Section 139A, with the same four-year maximum on indictment and defences that mirror the general offence (good reason, lawful authority, work, education, religion, national costume).⁵

The Mandatory Minimum for Second Offences

This is where the law hits hardest. Under section 315 of the Sentencing Act 2020, anyone aged 16 or over convicted of a second knife possession offence faces a mandatory minimum custodial sentence.⁶ For adults, that minimum is six months’ imprisonment. For 16- and 17-year-olds, it is a four-month detention and training order. A judge can only depart from the minimum if there are exceptional circumstances relating to the offence or the offender, and courts rarely find that bar met.

The minimum applies across any combination of Section 139 (bladed article in public), Section 1 of the Prevention of Crime Act 1953 (offensive weapon), Section 139A (bladed article on school premises), and Section 6 of the Offensive Weapons Act 2019 (corrosive substance in public).⁶ A first conviction for carrying an offensive weapon followed by a second for carrying a knife still triggers it.

Buying Knives: Age Limits and Delivery

It is illegal to sell a knife or bladed article to anyone under 18 in England, Wales, and Northern Ireland.⁴ Scotland allows a narrow exception for cutlery and kitchen knives, which can be sold to 16- and 17-year-olds. Both buying while underage and selling to a minor are criminal offences.

Most major retailers voluntarily apply a “Think 25” or “Think 21” policy, so expect to be asked for identification when buying any knife in a shop even if you are clearly an adult.⁷

Online sales involve extra verification. Sellers must verify age at the point of sale, and incoming legislation adds a two-step system: the buyer provides an official identity document, such as a passport or driving licence, with a current photograph as a liveness check at the order stage.⁸ At delivery, the courier checks the recipient’s identity and age against an official document. The package can only be handed to the buyer in person, not left at the door, with a neighbour, or in a safe place. Handing a knife package to anyone other than the verified buyer becomes a specific offence under the new provisions.

Police Stop and Search

Officers can stop and search you for a bladed article under the Police and Criminal Evidence Act 1984 if they have reasonable grounds to suspect you are carrying one.⁹ That suspicion must rest on objective factors, not generalised assumptions about appearance, age, or area. The officer must explain the reason for the search and identify themselves.

In areas where serious violence is expected or weapons are believed to be circulating, an inspector or higher-ranking officer can authorise a Section 60 order under the Criminal Justice and Public Order Act 1994.¹⁰ While the order is in effect, any uniformed officer within the designated area can search anyone without needing individual grounds. These orders last up to 24 hours and cover a defined geographic boundary. Section 60 searches can only look for weapons; the power cannot be used for drugs or other items.¹¹

Getting Rid of a Knife Safely

If you own a knife that has become prohibited under recent legislation, or you simply want to dispose of one, there are lawful routes.

Knife surrender bins, run by organisations such as Word 4 Weapons with Home Office funding, let you deposit items anonymously for secure destruction. The government also periodically runs mobile surrender vans staffed by operators who guide you through the process.¹² When specific bans take effect, formal compensation schemes typically run first. The 2024 zombie-style knife ban and the July 2025 ninja sword ban both included time-limited surrender windows for lawful owners to hand in newly prohibited weapons and receive payment.¹³

If you are transporting a knife to a surrender point, wrap it securely and put it in a sealed bag or box. Never carry it openly. Government guidance states that carrying a bladed article to a surrender bin or van, packaged according to those instructions, is likely to be considered a good reason if you are stopped by police on the way.¹² You can also hand knives in at a police station, though it is worth phoning ahead to confirm the procedure.

Scotland and Northern Ireland

Most of the rules above apply in England and Wales. Scotland and Northern Ireland have their own frameworks with some differences.

Scotland’s equivalent carrying offence sits in section 49 of the Criminal Law (Consolidation) (Scotland) Act 1995 rather than Section 139. The three-inch non-locking folder exception is the same and the defences are broadly similar, though Scotland’s statute uses “reasonable excuse” rather than “good reason.” Scotland also permits sales of cutlery and kitchen knives to 16- and 17-year-olds.⁴

Northern Ireland applies Section 139 but with different summary sentencing: up to 12 months’ imprisonment on summary conviction, compared with six months in England and Wales. The maximum on indictment is the same four years.¹ If you live in or travel to Northern Ireland, the higher summary maximum is worth knowing.

1
Legislation.gov.uk. Criminal Justice Act 1988 – Section 139
2
GOV.UK. Statutory Guidance – Offensive Weapons Act 2019
3
GOV.UK. Zombie-Style Knives Banned
4
GOV.UK. Selling, Buying and Carrying Knives and Weapons
5
Legislation.gov.uk. Criminal Justice Act 1988 – Section 139A
6
The Crown Prosecution Service. Knife and Other Weapons Offences
7
GOV.UK. Sale of Knives – Voluntary Agreement by Retailers
8
GOV.UK. Crime and Policing Bill – Delivery of Bladed Articles and Bulk Sales
9
Legislation.gov.uk. Police and Criminal Evidence Act 1984
10
Legislation.gov.uk. Criminal Justice and Public Order Act 1994 – Section 60
11
National Police Chiefs’ Council. Section 60 Authorisation Standards
12
GOV.UK. Extended Knife Surrender Arrangements 2025
13
UK Parliament. Knife Surrender and Compensation – Hansard