FAQs

The claim is being brought against Amazon, the US tech company that operates the UK's largest online retail marketplace at amazon.co.uk.

We believe Amazon is breaching competition law by preventing the sellers on its platform from offering lower prices elsewhere on the internet.

Since consumers cannot find a better deal off Amazon, Amazon is not worried about being undercut by other e-commerce platforms and charges sellers higher fees to sell on Amazon.

Sellers pass on these higher costs to consumers like you, who end up paying higher prices for products they purchase from third-party sellers on Amazon's marketplace.

You can find a detailed explanation of Amazon's pricing policies on the Home page.

Yes. 

Claims of this nature can take several years to reach a trial or settlement. It may be possible to resolve the claim sooner and before trial if a settlement with Amazon can be reached. We will update this website as the claim progresses. You can track the claim's progress here.

No money is available right now. 

The precise value of the claim will be determined by economic experts at a later stage of the proceedings. We will need to win at trial or reach a settlement with Amazon to secure compensation for the proposed class.

If you purchased a product from a third-party seller on Amazon's UK e-commerce marketplace at amazon.co.uk on or after 15 August 2019 then you are a member of the proposed class and may be entitled to compensation.

You can check whether you bought products from a third-party seller on Amazon by logging into you Amazon.co.uk account.

Once you are logged into your account, navigate to the "Your Orders" section of your account. You can then click on "Order Details" for any individual purchases. Look for text that says "Sold by", followed by the name of the seller. If anyone other than Amazon is listed after "Sold by", that indicates you purchased a product from a third-party seller and may be a member of the class that ACSO represents.

You can also download an invoice from the same "Order Details" page that will list the third-party seller from whom you purchased the relevant product. 

When purchasing an item on Amazon's UK marketplace, the product listing page will also clearly identify the third-party seller from whom you are buying a product. 

No.

You will not have to pay anything to be a part of the claim and you face no personal risk by being a member of the class. 
 
The Association of Consumer Support Organisations has secured litigation funding to cover its costs from a reputable litigation funder that is a member of the Association of Litigation Funders of England and Wales. The funder will also cover Amazon's legal costs, in the event that the claim is unsuccessful.

This claim is being brought on an ‘opt-out’ and ‘opt-in’ basis. This means that if you fit the class definition you will automatically be included in the claim unless you choose to opt out. If you live abroad but otherwise fit the class definition, you need to opt into the claim.

No, if you live in the UK you don't need to do anything to be a part of this claim.

We would encourage you to register for updates on the case here.

If the Tribunal certifies the claim, it will proceed to trial on behalf of the individuals who are automatically included in the class. If the claim is successful at trial or a settlement is reached, you may have to prove that you are a member of the proposed class.

You can find out more about eligible purchases here.

If you are within the proposed class (i.e., if you purchased a product from a third-party seller on Amazon's UK e-commerce marketplace at amazon.co.uk on or after 15 August 2019) then you will be included in the claim, even if you no longer have an Amazon account.

If the claim is certified by the Competition Appeal Tribunal, this website will be updated to provide information about how to opt out of the claim in due course. 

If you choose to opt out, you will not be able to request any payment if the claim is successful.

The Association of Consumer Support Organisations (ACSO) is bringing this claim on behalf of millions of UK consumers.

ACSO is a non-profit organisation dedicated to promoting consumers’ rights within the UK’s civil justice systems.

ACSO’s core mission is to engage with politicians, regulators, businesses and the media to ensure that a well-functioning, competitive and sustainable civil justice system exists for all consumers.

For more information about ACSO and its advisors, please see the About Us page of this website.

You can also find out more about ACSO on its website.

A class representative is an organisation or individual who represents the interests of the class on whose behalf compensation is being sought. The class representative has conduct of the collective proceedings on behalf of all class members and works with the legal team to progress the claim. 

The Association of Consumer Support Organisations is seeking the Competition Appeal Tribunal's permission to act as the class representative for this claim.

Stephenson Harwood is a large international law firm headquartered in London. Stephenson Harwood has extensive experience of acting for claimants in group litigation arising from breaches of competition law.

For example, Stephenson Harwood represents nearly 2,000 high street retailers and other businesses in a landmark case against Visa and Mastercard and acts for 7 of the UK's leading supermarkets in ongoing proceedings against Norwegian salmon producers.

You can find out more about Stephenson Harwood and their work, here.

Competition law is a set of rules that ensures that companies are not acting in a way that could harm their competitors or consumers. When the market is competitive, consumers benefit as prices are lower and the quality of services you receive is higher.

This claim is about enforcing competition law for your benefit.

The Competition Appeal Tribunal will determine the claim. The Competition Appeal Tribunal is a specialist court based in London which exclusively hears cases involving competition law issues, including collective actions like this claim.

The Tribunal publishes its Rules and Guidance, together with information about what it does and details of its ongoing cases, on its website.

Collective proceedings are a form of class action, brought on behalf of a group of individuals who have been affected by the same issue or event arising from a breach of competition law.

In our case, the Association of Consumer Support Organisation is seeking to represent UK consumers who may have overpaid when buying products from third-party sellers on Amazon's UK marketplace at amazon.co.uk.

Before collective proceedings can formally begin, the Competition Appeal Tribunal must give the class representative permission to proceed. This process is known as "certification". 

The Association of Consumer Support Organisations (ACSO) filed its application for certification on 14 August 2025. 

This website will be updated to provide information on the hearing of ACSO's application for certification and its outcome.

You can sign up for updates to receive the latest information about the claim here.

Your information will only be used for the purpose of communicating with you about this claim.

In addition, you can track the claim's progress here.

The best way to help is to tell your friends and family about this claim.

By our estimates, roughly 46 million UK consumers may have overpaid when buying products from third-party sellers on Amazon and we want to ensure that as many people as possible get the compensation they deserve.

Click here to share this website and spread the message.