The UK’s opt-out collective action regime was designed to solve a long-standing problem in consumer justice.
When millions of people are affected by the same issue — often through small, repeated losses — it rarely makes sense for individuals to bring claims on their own. The cost, time and complexity are simply too high relative to what they might recover.
Opt-out collective actions were introduced to address that imbalance. Instead of requiring individuals to come forward, a single case can be brought on behalf of everyone affected. If you meet the criteria, you are included automatically.
On paper, it is an elegant solution. But in practice, a different problem has emerged — one that is becoming increasingly difficult to ignore.
Participation rates are consistently low.
A system designed for inclusion, but struggling with engagement
Unfortunately, the participation gap stems from the very feature that makes opt-out claims powerful: the absence of a sign-up stage at the beginning.
Because individuals are included automatically:
- There is no early engagement with the case
- There is no ongoing relationship between the claimant and the claim.
As a result, many consumers move through the entire lifecycle of a case without ever realising it exists. By the time compensation becomes available — often years later — the connection between the claim and the individual has been lost.
Research published by Thorndon Partners highlights the scale of the challenge. Only 37% of the UK public said they understood what happens in the settlement of a group action case, while 67% said they had not seen any coverage or adverts about settlements.
When eligibility becomes abstract
Time plays a significant role in this disconnect.
Opt-out collective actions can take years to progress through certification, trial and potential settlement. During that period, the underlying issue may fade from memory.
A charge on a mobile bill. A fee embedded in a purchase. A pricing practice affecting everyday services. Individually, these are rarely memorable events. When revisited years later, eligibility can feel uncertain or irrelevant.
Consumers are left asking:
- Was I actually affected?
- Does this still apply to me?
- Is it worth the effort to check?
Without clear context, many simply disengage.
Legally, there are requirements to notify class members when compensation schemes are approved. But in practice, these mechanisms have limitations. Emails may go unopened. Letters may be ignored. Public notices may never be seen.
Even when they are received, the language used can be technical or unfamiliar. For many people, it does not immediately translate into a clear understanding of what action, if any, is required.
This is especially important in competition claims, where the legal language can feel remote from everyday life.
Thorndon’s polling found that fewer than 30% of people understood terms such as cartel behaviour, abuse of market power or anti-competitive practices. So even when notices are legally sufficient, they may still fail in practice. If people do not understand the language, they are far less likely to understand that a case affects them personally.
The result is a system that meets its legal obligations but still struggles to reach the people it was designed to serve.
A gap between class size and real-world outcomes
This creates a stark contrast between the theoretical reach of a claim and its practical impact.
A case may affect millions of consumers. A settlement may run into tens or hundreds of millions of pounds. But the number of people who actually come forward to claim can be a small fraction of that total.
When that happens, compensation may be reduced, redistributed, or left unclaimed entirely. From a legal perspective, the case may still be considered a success. But from a consumer perspective, the outcome is far less tangible.
The clearest illustration remains Gutmann v Stagecoach. In this case, despite affecting approximately 1.4 million rail passengers, fewer than 1% of eligible consumers came forward to claim compensation.
Out of a settlement structured as up to £25 million, only £216,485 was claimed. As a result, Stagecoach was ultimately required to pay £10.2 million rather than the full headline amount. In addition, £3.7 million of unclaimed damages was redistributed to the Access to Justice Foundation.
This was a lawful and structured outcome. But it also highlights the scale of the participation gap in practice.
This is not just a theoretical concern. Recent discussion at CORLA highlighted that the Competition Appeal Tribunal (CAT) is looking beyond legal success alone when assessing outcomes. It is not enough for a case to succeed on liability or settlement value in isolation. The Tribunal is concerned with whether the proceedings deliver a meaningful outcome for the class.
That includes:
- The level of damages made available
- The likely level of take-up by class members
- What happens to any unclaimed damages.
In other words, distribution is becoming part of how success is evaluated.
For those running and funding claims, this has practical implications. Low take-up does not affect consumers alone. It can also influence how outcomes, costs and overall success are viewed.
Why closing the gap matters
The participation gap raises an important question: is collective redress delivering meaningful outcomes, or simply establishing liability in principle?
Addressing this challenge is not about increasing pressure on consumers to claim. It is about recognising that awareness and engagement are not secondary considerations. They are central to whether the system works.
For opt-out collective actions to deliver on their promise, people need:
- Visibility of claims as they develop
- Clear explanations of what those claims involve
- Timely information when action becomes relevant.
Without that, inclusion on paper does not translate into participation in reality. And without participation, even the most successful cases risk falling short of their purpose.
At Join the Claim, we have published a new guide exploring this issue and what it means for law firms, funders and class representatives running collective actions.
If you are running or funding an opt-out collective action and would like to explore how awareness and claimant engagement can support participation, we are always open to an informal conversation.
