These Rules amend the Competition Appeal Tribunal Rules 2015 (S.I. 2015/1648) (“the CAT Rules”) to enable Part 3 of the CAT Rules to apply to applications to review certain decisions of, and appeals of penalties imposed by, the Competition and Markets Authority (“the CMA”) under its digital markets and competition functions pursuant to the Digital Markets, Competition and Consumers Act 2024 (c. 13) (“the 2024 Act”). These Rules also make a minor amendment to the CAT Rules consequential to the Competition (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/93) (“the EU Exit Regulations”).