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NOTE—On 25 April 2023, the Government published its Digital Markets, Competition and Consumers Bill (DMCC Bill), which introduces significant reforms to UK competition law (across merger control, antitrust, market studies/investigations and digital markets). The DMCC Bill will come into effect following parliamentary approval. This Practice Note will be updated to reflect the relevant changes once the DMCC Bill becomes law. For the key changes introduced by the DMCC Bill, see further, The Digital Markets, Competition and Consumers Bill: key provisions from a competition and digital markets perspective

The Competition Appeal Tribunal (CAT) is a specialist tribunal with the jurisdiction to hear competition damages actions, both stand-alone actions and follow-on actions (ie claims for damages which are brought after and rely on an infringement in a decision issued by a competition authority), and collective actions, both ‘opt-in’ and ‘opt-out’.

Under section 15 of the Enterprise Act 2002, the Competition Appeal Tribunal (CAT) is required to make rules with respect to proceedings before it; the current rules are the Competition Appeal Tribunal Rules 2015 (the CAT Rules), supported by