Le registre international
At least two registers coexist in the United Kingdom:
The United Kingdom Competition Appeal Tribunal is a specialist judicial body with cross-disciplinary expertise in law, economics, business and accountancy which hears and decides cases involving competition or economic regulatory issues.
It contains namely collective cases brought and decisions handed within the Competition private enforcement scope on an opt-in or on an opt-out basis, according to Section 47b Competition Act.
The United Kingdom lists and informs about Group actions “which give rise to common or related issues of fact or law” and engaged according to r19.10 of the Civil Procedure Rules.
Representative actions are not registered as such. See for instance TikTok the case.