This Practice Note considers the regime for the resolution of intra-EU investment disputes in light of the Agreement for the termination of Bilateral Investment Treaties between the Member States of the European Union (the Termination Agreement or Termination Treaty or the EU plurilateral treaty) and the decision of the Court of Justice of the Europe Union (CJEU) in Slovakia v Achmea (the Achmea case). The Practice Note considers the background to the Termination Treaty and how investment disputes within the EU are to be resolved in accordance with its terms. This topic may be referred to as investment disputes post-Achmea and after Brexit.