Until the judgments and orders of the Court of Justice of the European Union in all proceedings and requests for preliminary rulings referred to in Article 86 have become final, the United Kingdom may intervene in the same way as a Member State or, in the cases brought before the Court of Justice of the European Union in accordance with Article 267 TFEU, participate in the procedure before the Court of Justice of the European Union in the same way as a Member State. During that period, the Registrar of the Court of Justice of the European Union shall notify the United Kingdom, at the same time and in the same manner as the Member States, of any case referred to the Court of Justice of the European Union for a preliminary ruling by a court or tribunal of a Member State.

The United Kingdom may also intervene or participate in the procedure before the Court of Justice of the European Union in the same way as a Member State:

(a) in relation to cases which concern a failure to fulfil obligations under the Treaties, where the United Kingdom was subject to the same obligations before the end of the transition period, and where such cases are brought before the Court of Justice of the European Union in accordance with Articles 258 TFEU before the end of the period referred to in Article 87(1) or, as the case may be, until the moment, after the end of that period, at which the last judgment or order rendered by the Court of Justice of the European Union on the basis of Article 87(1) has become final;

(b) in relation to cases which concern acts or provisions of Union law which were applicable before the end of the transition period to and in the United Kingdom and which are brought before Court of Justice of the European Union in accordance with Article 267 TFEU before the end of the period referred to in Article 87(1) or, as the case may be, until the moment, after the end of that period, at which the last judgment or order rendered by the Court of Justice on the basis of Article 87(1) has become final; and

(c) in relation to the cases referred to in Article 95(3).