Case C-209/20: Judgment of the Court (Third Chamber) of 20 May 2021 (request for a preliminary ruling from the Upper Tribunal (Tax and Chancery Chamber) — United Kingdom) — Renesola UK Ltd v The Commissioners for Her Majesty’s Revenue and Customs (Reference for a preliminary ruling — Customs union — Assessment of validity — Implementing Regulation (EU) No 1357/2013 — Determination of the country of origin of solar modules assembled in a third country from solar cells manufactured in another third country — Regulation (EEC) No 2913/92 — Community Customs Code — Article 24 — Origin of goods whose production involved more than one third country — Concept of ‘last substantial processing or working’)