Judgment of the Court (Grand Chamber) of 26 March 2020.#Erik Simpson v Council of the European Union and HG v European Commission.#Review of the judgments of the General Court of the European Union in Simpson v Council (T‑646/16 P) and HG v Commission (T‑693/16 P) — Civil service — Composition of the panel of judges which delivered the judgments at first instance — Procedure for the appointment of a judge to the European Union Civil Service Tribunal — Article 47 of the Charter of Fundamental Rights of the European Union — Tribunal established by law — Incidental review of legality — Effect on the unity and consistency of EU law.#Joined Cases C-542/18 RX-II and C-543/18 RX-II.