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Ten years of opt-out collective actions in the UK

  • Antitrust & competition
October 16, 2025
Craig Arnott & Charlie Rooke

Summary

Ten years after the UK’s landmark collective actions reform, the opt-out regime has matured from a theoretical experiment into a powerful mechanism for delivering accountability against corporate misconduct.

With the advent of the act, groups of consumers and businesses could for the first time pursue claims in the Competition Appeal Tribunal (CAT) without each individual claimant being required to join the case. The reform was a landmark step in improving access to…

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