The last three months have heralded a period of unprecedented excitement in the sphere of collective competition claims.

In August 2021, the Competition Appeal Tribunal (‘CAT’) certified the first ever Collective Proceedings Order (‘CPO’), permitting Walter Merricks to pursue an ‘opt out’ group claim against Mastercard for established breaches of competition law. Merricks is now authorised as class representative on behalf of 46.2m potential claimants in a claim valued at a whopping £13.8bn.

In the weeks that followed, the CAT certified two further CPOs in multi-million pound claims against both BT and two train operating companies (namely First MTR and Stagecoach). These decisions ha...

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