This week's edition of Competition weekly highlights includes, from a UK perspective: (1) the CMA’s decision to launch a consultation on proposed changes to the CMA’s guidance on applications for leniency and no-action in cartel cases, (2) publication by the CMA of guidance on how mergers are investigated, and (3) publication of guidance by the CMA on how it will deliver the 4Ps to support growth under the new digital markets competition regime. This week's highlights also includes, from an EU perspective: (1) the Commission’s decision to fine Apple €500m for breaching its anti-steering obligation under the DMA, (2) the Commission’s decision to close its investigation into Apple's user choice obligations under the DMA, (3) the Commission’s decision to issue its preliminary findings in relation to its non-compliance investigation into whether Apple’s new contractual requirements for alternative app distribution breach the DMA, (4) the Commission’s decision to fine Meta €200m for breaching the DMA obligation to give consumers the choice of a service that uses less of their personal data, (5) publication by the Commission of its second annual report on the DMA, (6) the Court of Justice’s judgment concerning a national reference from Poland on exemption from property tax, (7) a judgment from the General Court dismissing Symrise’s appeal against a dawn raid in the Commission’s fragrance cartel investigation, and (8) a judgment from the General Court dismissing an appeal regarding Deutsche Lufthansa’s challenge against the Commission’s decision to grant Frankhurt Hahn airport aid following referral back from Court of Justice.