Large group claims – sometimes described as collective actions, class actions or multi-party litigation – allow many people who share a similar legal grievance to have their cases managed together rather than one by one. For anyone considering joining such a claim, the practical question is often not only whether they have a case, but how that case will be represented, who makes the decisions, and how the costs are handled. This article explains, in general terms, how legal representation typically works in large group claims and why the structure matters.

What Counts as a Large Group Claim?
Group claims generally arise where a number of people have been affected by the same event, product, practice or set of circumstances, and their cases raise common questions of fact or law. Aggregating those claims can allow a court to decide shared issues once, rather than repeating similar arguments across many separate proceedings. The Congressional Research Service notes that a central purpose of class actions is to improve the efficiency and economy of litigation, and to make it feasible for people to pursue claims when an individual case might not justify the cost on its own.
The precise mechanisms differ significantly between jurisdictions. In England and Wales, for example, there are several distinct routes, each with its own rules on who represents whom and how people join. The United States has its own framework under Rule 23 of the Federal Rules of Civil Procedure. Because the applicable rules vary, the way representation is arranged in any given claim depends on the jurisdiction, the type of loss, and the specific procedural route chosen.
The Main Procedural Routes and Who Leads Them
In England and Wales, the available mechanisms are broadly grouped into a few categories. Each one shapes representation differently:
- Group Litigation Orders (GLOs). A GLO is an order that provides for the case management of claims raising common or related issues of fact or law, often called the “GLO issues.” GLOs are generally opt-in: claimants must take positive steps to be added to a group register. A lead solicitor usually applies for the order and manages the register, coordinating the other claimant firms.
- Representative actions. Under the Civil Procedure Rules, a claim may be brought or continued by one or more people as representatives of others who have the “same interest” in the claim. This route typically operates on an opt-out basis, meaning the represented group need not be individually identified as parties, although the court’s permission is generally required to enforce a judgment against someone who is not a party.
- Collective proceedings in the Competition Appeal Tribunal. This regime, introduced for certain competition law claims, allows a claim to proceed on an opt-in or opt-out basis once a collective proceedings order is certified. Proceedings are pursued by a class representative, who must be authorised by the Tribunal.
- Joint claims. Multiple claimants may also be joined in a single claim form where their cases can conveniently be disposed of together. This is a simpler route but can become unwieldy at very large scale.
In the United States, a federal class action must satisfy the requirements of Rule 23, which include numerosity, commonality, typicality and adequacy of representation, as well as one of the additional criteria for certification. The court conducts what is often described as a rigorous analysis before allowing a case to proceed on a class basis. The rules governing group litigation orders in England and Wales are published on the Civil Procedure Rules section of the Ministry of Justice website for those who want to read the underlying provisions.
The Role of the Lead Solicitor and the Claimant Group
Where several firms act for different claimants in the same group litigation, it is common for them to form a solicitors’ group and for one firm to take the lead. The lead solicitor typically acts as the main point of contact for the court and the opposing parties, applies for the group order, and manages the group register. The relationship between the lead firm and the other firms is usually defined in writing and recorded with the court, so that responsibilities and reporting lines are clear.

Claimants in ordinary litigation are generally entitled to be represented by solicitors of their choosing. In group litigation, courts have recognised that this principle may be qualified in order to achieve the efficient conduct of the case. In practice, claimants in a single group are often represented by one counsel team, and courts may require co-claimants to be jointly represented unless separate representation is authorised. Such authorisation is typically the exception rather than the rule and tends to be granted where it is needed to avoid injustice.
The Class Representative
In opt-out regimes, representation is concentrated in a class representative. Under the collective proceedings regime, for instance, the Tribunal may authorise a person or organisation to act as class representative only where it considers it just and reasonable for them to do so. The class representative is generally the ultimate client of the advisers working on the case – including the solicitors and any funder – and is responsible for giving timely instructions and ensuring the claim is pursued in the interests of the class. Solicitors usually help by advising on procedural, strategic and logistical steps and by acting as a conduit between the representative and the wider case team.
Because representation involves decisions that affect everyone in the group, courts pay close attention to how interests are aligned. Where a group contains subgroups with materially different positions, the court may consider whether those interests can be represented fairly within the same structure.
How Representation Is Funded
Funding arrangements are a central feature of group claims and are usually documented before proceedings are filed. Costs in group litigation are often divided conceptually into common costs – those incurred in resolving the shared issues – and individual costs, which relate to a particular claimant’s circumstances. The court may give directions on how common costs and test-claim costs are to be shared among those on the group register.

Depending on the jurisdiction and the case, representation may be funded through a combination of claimant contributions, conditional fee agreements, damages-based agreements where permitted, third-party litigation funding, and after-the-event insurance. In the collective proceedings regime, for example, the class representative may enter into a litigation funding agreement under which the funder agrees to bear the costs of the litigation by reference to a budget, and the agreement typically sets out how the funder is to be reimbursed. These arrangements are subject to the relevant rules and to the court’s or Tribunal’s oversight, and their precise terms differ from case to case.
Joining a Claim: Opt-In, Opt-Out and Deadlines
How a person becomes part of a group claim depends on the route used. Opt-in mechanisms, such as GLOs, generally require a claimant to issue or register their claim before a specified cut-off date, after which joining usually requires the court’s permission. Opt-out mechanisms, by contrast, typically bind members of a defined class unless they take steps to exclude themselves. In opt-out cases, the court or Tribunal may direct how notice is given to potential class members, sometimes with a defined period during which people can opt out or come forward.
The Court’s Oversight
Courts and tribunals play an active case-management role in group claims. A GLO requires the court’s consent, and a collective proceedings order must be certified. The court may direct that common issues be tried first, that certain claims proceed as test claims, or that shared issues be decided separately from individual ones. Judgments on the shared issues are generally binding on the parties to claims entered on the group register at the relevant time, subject to any directions the court gives.

Settlements are also subject to oversight. In many regimes, a proposed settlement cannot bind the group unless it is approved by the court or Tribunal as fair, reasonable and adequate. This approval process is intended to protect the interests of people who may not be actively participating in the litigation but would be bound by its outcome.
Coordination Between Claimants and Firms
Large claims often involve several law firms, funders and experts working alongside one another. The rules encourage cooperation and efficient conduct, and the lead solicitor or class representative usually coordinates the various contributors. Questions about how claimant representation is organised – and how courts resolve disagreements about who should lead a group – have attracted related legal coverage as group litigation has grown. In practice, courts tend to focus on the overriding objective of dealing with cases justly and at proportionate cost when deciding how representation should be structured.
Settlement and Distribution
If a group claim succeeds through judgment or settlement, the recovery is often dealt with as an aggregate sum before being distributed to the people it is intended to compensate. The details of distribution – including how individual shares are calculated, what evidence is required, and by when claims must be made – are typically set out in a court-approved scheme or plan. Large groups may require substantial notification campaigns, sometimes over a considerable period, and there is usually a final cut-off date after which no further claims are accepted. The treatment of any undistributed amount depends on the terms of the scheme and the applicable rules.

Key Points to Remember
Legal representation in large group claims is structured to balance individual participation with the practical demands of litigating shared issues efficiently. The route chosen, the role of the lead solicitor or class representative, the funding model and the court’s oversight all shape how a claim proceeds and how any outcome is shared. Because these arrangements are governed by jurisdiction-specific rules and by the terms of each case, anyone considering joining a group claim is generally best served by seeking independent advice on the specific structure and funding terms that would apply to them.