Underage sales


If you suspect that a Slough based business is selling age restricted products to minors contacts us via the Citizen's advice consumer helpline on 03454 04 05 06 or by using the online contact form


You can contact the trading standards team on 01753 475111 (Enforcement & Regulatory option) for information on age restricted sales.

Knives and other bladed items

In the guide

This guidance is for England & Wales

It is illegal to sell knives and other similar products to anyone under the age of 18. The legislation is enforced by the police and trading standards. Sellers should always verify the age of the purchaser before a sale.

Further restrictions are included in the Knives Act 1997, which specifically deals with knives advertised for use in 'combat'.

The law

Under the Criminal Justice Act 1988, it is an offence for any person to sell to a person under the age of 18:

  • any knife, knife blade or razor blade
  • any axe
  • any other article that has a blade or that is sharply pointed and that is made or adapted for use for causing injury to the person

The prohibition does not apply to:

  • folding pocket knives if the cutting edge of the blade is less than 7.62cm (three inches)
  • replacement cartridges for safety razors, where less than 2mm of the blade is exposed

Whether a particular article is a knife is a question of fact, but using a wider definition this legislation prohibits sales of, for example, sheath knives, kitchen knives, craft knives and carpet knives to persons under the age of 18. The prohibition is not intended to apply to articles such as scissors or compasses.

Under the Knives Act 1997 it is an offence to market a knife and also an offence to publish marketing material in relation to a knife in a way that either:

  • indicates or suggests that it is suitable for combat (the term 'suitable for combat' means that the knife is suitable for use as a weapon for inflicting injury or causing fear of injury to the person)
    ... or
  • is otherwise likely to stimulate or encourage violent behaviour involving the use of the knife as a weapon

An indication or suggestion that a knife is suitable for combat may be made by a name or description in any of the following ways:

  • applied to the knife
  • on the knife or on any packaging in which it is contained
  • included in any advertisement that expressly or by implication relates to the knife

There are exemptions to allow sales of such items for legitimate purposes such as for use by armed forces, as antiques or as collectors' pieces.


If you are charged with an offence under the Knives Act 1997, you have the defence that you did not know or suspect that the way in which the knife was marketed, or the marketing material, amounted to an indication or suggestion that the knife was suitable for combat or was likely to stimulate or encourage violent behaviour involving the use of the knife as a weapon.

If you are charged with an offence under either law, you have the defence that you took all reasonable precautions and exercised all due diligence to avoid committing the offence. With particular reference to the Criminal Justice Act 1988, what does this mean? It means that you are responsible for making sure that you and your staff do not sell knives to people under the age of 18.

Keeping within the law

In order to keep within the law and therefore satisfy the legal defences, you should introduce an age verification policy and have effective systems to prevent an underage sale. These systems should be regularly monitored and updated as necessary to identify and put right any problems or weaknesses, or to keep pace with any advances in technology.

Key best practice features of an effective system include:

Age verification checks

Always ask young people to produce proof of their age. The Chartered Trading Standards Institute, the Home Office and the Association of Chief Police Officers support the UK's national Proof of Age Standards Scheme (PASS), which includes a number of card issuers. You can be confident that a card issued under the scheme and bearing the PASS hologram is an acceptable proof of age.

A passport or photocard driving licence can also be accepted, but make sure the card matches the person using it and that the date of birth shows they are over 18. Military identification cards can be used as proof of age but, as with other forms of identification, make sure the photo matches the person presenting the card and check the date of birth. Be aware that military identification cards can be held by 16 and 17-year-old service people.

Some young people may present false identification cards so it is advisable to also check the look and feel of a card. For example, the PASS hologram should be an integral part of a PASS card and not an add-on. 

If the person cannot prove they are over 18, or if you are in any doubt, then the sale should be refused.

Please see the Home Office False ID guidance for more information.

Operate a Challenge 21 or Challenge 25 policy

This means that if the person appears to be under the age of 21 or 25, they will be asked to verify that they are over 18 by showing valid proof of age.

Staff training

Make sure your staff are properly trained. They should know which products are age restricted, what the age restriction is and the action they must take if they believe a person under the age of 18 is attempting to buy. It is important that you can prove that your staff have understood what is required of them under the legislation. This can be done by keeping a record of the training and asking members of staff to sign to say that they have understood it. These records should then be checked and signed on a regular basis by management or the owner.

Maintain a refusals log

All refusals should be recorded (date, time, incident, description of potential buyer). Maintaining a refusals log will help to demonstrate that you actively refuse sales and have an effective system in place. Logs should be checked by the manager / owner to ensure that all members of staff are using them.

A specimen refusals log is attached.

Some tills have a refusals system built in. If using a till-based system, you should ensure that refusals can be retrieved at a later date. You should also be aware that some refusals are made before a product is scanned.

Store & product layout

Identify the age-restricted products in your store and consider moving them nearer to, or even behind, the counter. Consider displaying dummy packs so that people have to ask for the products if they want to buy them.

Till prompts

If you possess an EPoS system, it may be possible to use it to remind staff of age restrictions via a prompt. Alternatively, stickers can be used over certain product barcodes.


Display posters showing age limits and a statement regarding the refusal of such sales. This may deter potential purchasers and act as a reminder to staff.

Closed circuit television (CCTV)

A CCTV system may act as a deterrent and reduce the number of incidents of underage sales. It will also help you to monitor 'blind spots' within your store if it is not possible to change the layout or relocate the products behind, or closer to, the counter.

Online sales

If you sell by distance means, such as online or via a catalogue, you should set up an effective system capable of verifying the age of potential purchasers to ensure they are 18 or older for the purchase of knives. Please see 'Online sales of age-restricted products' for more information.


If you commit an offence under the Criminal Justice Act 1988 of selling to a person under the age of 18, the maximum penalty is a fine and six months' imprisonment.

If you commit an offence under the Knives Act 1997 over the way a knife is marketed, the maximum penalty is a fine and two years' imprisonment.

Key legislation

Last reviewed / updated: April 2017

PixelPlease note

This information is intended for guidance; only the courts can give an authoritative interpretation of the law.

The guide's 'Key legislation' links may only show the original version of the legislation, although some amending legislation is linked to separately where it is directly related to the content of a guide. Information on amendments to UK legislation can be found on each link's 'More Resources' tab; amendments to EU legislation are usually incorporated into the text.

Alternative Resolutions

From time to time Trading Standards send volunteers under the age of 18 to check businesses are not selling age restricted products to underage children.  Volunteers under the age of 25 are also used to check adherence to Think 25 policies.

If you or the business sells, we may offer you attendance to a BTEC level 2 accredited course, the investigating officer will advise you if this will be offered to you.  To register for the BTEC level 2 course use the online Alternative Resolutions form.