Group litigation allows people with similar legal complaints to come together and seek justice collectively.
For first-time claimants, the idea of joining a group claim can feel daunting. But once you understand how UK group litigation actually works — and how different types of claims are structured — it becomes much easier to decide whether it’s right for you.
Here are ten essential facts to help you make an informed decision before getting involved.
1. What group litigation is
Group litigation is a legal process whereby multiple individuals with similar complaints come together and file a collective lawsuit.
For example, if thousands of people have purchased the same faulty product, they may be able to take collective action. This allows evidence to be shared, legal costs to be spread, and common issues to be addressed through a single coordinated process.
Not all group claims work the same way.
- Opt-in group claims require individuals to actively sign up and instruct solicitors. Most group litigation in the UK falls into this category.
- Opt-out collective actions automatically include everyone who meets the criteria, unless they choose to opt out.
Understanding which type of claim you’re dealing with is essential, as it affects what you need to do, and when.
2. Eligibility: How to determine if you qualify
Eligibility depends on the type of claim.
- In opt-in claims, you must show that you were affected and meet the criteria set by the law firm running the case.
- In opt-out claims, you may be included automatically if you fall within the defined group.
Where Join the Claim works with a partner law firm, we provide eligibility checkers to help you understand whether a claim applies to you and what steps (if any) you need to take.
3. Costs and fees: Making group litigation more affordable
One of the biggest advantages of group litigation is that it spreads the costs among all claimants. This often makes it more affordable than pursuing an individual legal action.
What’s more, law firms handling group litigation cases often operate on a no-win, no-fee basis, meaning you don’t have to pay legal fees unless the case is successful.
Because of no-win, no-fee, claimants benefit from high-quality legal representation without the financial burden of filing a lawsuit.
However, T&Cs will likely apply, and you should always check the small print.
4. What you’ll pay if you win: Understanding success fees
One of the lesser-known facts about group litigation, is what you pay if you win.
In collective actions, especially those run under no-win, no-fee agreements, claimants only pay legal fees if their case is successful. This makes group litigation accessible.
However, if you win, law firms often charge a success fee.
What is a success fee?
Law firms charge a success fee if a case results in a win or settlement.
Although this fee can sometimes seem high, it compensates firms for the risk they take by offering services without any upfront payment.
The success fee is typically a percentage of the compensation awarded to claimants and can vary depending on the case.
Example of a 25% success fee under a no-win no-fee agreement
| If the case is won or settled | If the case is lost |
Upfront fees | £0 | £0 |
Success fee | 25% | N/A |
Compensation awarded | £10,000 | £0 |
Fees paid by claimant | £2,500 (deducted from compensation) | £0 |
Amount received by claimant | £7,500 | £0 |
Understanding the costs upfront can help you decide whether the potential compensation is worth the fees and time involved. Always check the terms with your solicitor before proceeding.
5. The role of lead claimants
If you’ve watched movies about class action lawsuits, you’ll know there is sometimes a lead claimant or plaintiff. This is a person who sues the defendant and who represents the larger group.
This person’s experience and evidence are often used as a test case to set the foundation for the entire group’s claim. Other class members are generally not required to actively participate in the proceedings, although they remain bound by the outcome.
In the UK, most group litigation does not have a single lead claimant. Instead, everyone must show how they were affected, even though their case is managed alongside others with the same issue.
This structure allows courts and law firms to deal with common issues efficiently, while making sure each person’s circumstances are properly considered — rather than relying on one individual’s experience to stand in for everyone else.
There are two important exceptions:
- Opt-out collective actions (brought in the Competition Appeal Tribunal) do have a formal class representative who acts on behalf of everyone affected.
- In some group claims, the court may select a small number of test cases to decide shared legal or factual issues. The answers to those common questions then apply across the wider group.
6. Compensation distribution: How it works
If the group action is successful, the compensation awarded will be distributed among all claimants. In most cases, the distribution is typically based on the level of harm or loss each individual has experienced, ensuring each claimant receives fair compensation.
Claimants may sometimes receive different amounts if their circumstances or damages vary significantly.
Law firms managing the group action will handle the compensation process, ensuring everyone receives what they’re entitled to. You might have to provide proof of your losses to ensure you receive the correct amount of compensation.
In opt-out claims, affected individuals usually need to register at the end of the case to receive compensation.
7. Length of time: Understanding the timeline
Group litigation cases can take longer to resolve than individual claims. This is because organising a large group, gathering evidence, and navigating the legal process for multiple claimants can be complex.
It’s common for these cases to take several years to conclude, particularly if the defendant contests the claims.
While this might seem like a long time, the advantage of group litigation is that it often offers a greater chance of success.
You should be prepared for the potential time commitment. However, despite the length of the process, your involvement is likely to be minimal.
After providing evidence and confirming details about their situation, most claimants have limited day-to-day input or responsibilities. The legal team managing the case handles the bulk of the work, informing claimants of major updates and developments.
This means you can pursue justice without any disruption to your daily life.
8. Evidence and documentation: Why it’s crucial
In opt-in claims, you’ll likely need evidence to support your claim when joining a group action. This might include proof of purchase, medical records, or other relevant documentation showing how you’ve been affected by the issue.
This evidence helps prove your claim and may help strengthen your case. Your solicitor will guide you through the process of gathering and submitting evidence.
Law firms working on group actions may also engage external experts and barristers to build a strong, evidence-based case. These specialists will provide evidence and testimony to support your claim and maximise your chance of a successful outcome.
In opt-out claims, evidence requirements are often lighter initially, but proof may still be required later to receive compensation.
Your legal team will guide you on what’s needed and when.
9. How legal support works
In group litigation, claimants are represented by professional solicitors who specialise in collective actions. These lawyers manage the entire process, from gathering evidence and filing the claim to communicating updates and representing the group in court. They act as the primary point of contact for all claimants, ensuring everyone is informed about the case’s progress.
10. What happens after a case is won or settled
If the group action is successful, the compensation process begins. Law firms managing the group action will oversee the distribution of funds, ensuring each claimant receives their share. You will be contacted to confirm your details and arrange payment, which may involve providing bank information or other relevant documentation.
If the case is settled out of court, the terms will be communicated to all claimants, who may need to agree to the conditions before the settlement proceeds. Often, to simplify this process, representatives will make a decision about whether to accept a settlement on behalf of the larger group.
In some cases, successful group actions also lead to systemic changes in business practices, ensuring similar issues are less likely to occur in the future. Settlements may also include non-monetary agreements, such as commitments from the defendant to change their business practices or provide additional support for those affected.
Pros and cons: Understand the facts about group litigation and balance your options
Deciding whether to join a group action involves weighing the potential pros and cons. The rewards can be substantial, however, the process can be lengthy, and there’s always a possibility the case may not succeed.
Things to consider before joining a claim
Understanding the key facts about group litigation – from eligibility and costs to evidence and timelines – can help you decide whether or not to join a claim.
- Are you eligible: Before joining, check if you meet the eligibility requirements for the claim.
- What are the costs: Even if it’s no-win, no-fee, check if there are any potential deductions from your compensation, such as a success fee.
- How long it will take: Be prepared for the case to take time, often several years, to resolve.
- What evidence you need: Having the right proof strengthens your case and ensures you’re eligible for compensation.
Ready to get started?
Once you know what to expect, you can make an informed decision. Visit Join the Claim today to learn more about group litigation claims and take the first step toward justice.
Join the Claim connects consumers with SRA-regulated lawyers. You can check your eligibility if a claim is open with one of our trusted legal partners. If a group action has not yet been launched, simply register your interest, and we’ll keep you informed if a partner firm decides to take a claim forward.
- Last Updated: January 2026
- Next Update Scheduled: January 2027
