Arbitration analysis: On 22 October 2024, the Court of Appeal issued an important judgment in relation to the enforcement of ICSID arbitral awards, in the combined appeals of Infrastructure Services Luxembourg S.À.R.L. v Kingdom of Spain and Border Timbers Ltd v Republic of Zimbabwe. The Court of Appeal has confirmed that foreign states cannot rely on the principle of state immunity under section 1(1) of the State Immunity Act 1978 (SIA 1978) to set aside the registration of ICSID awards. This important decision brings the position under English law in line with the courts of other contracting states to the 1965 Convention on the Settlement of Investment Disputes between States and Nationals of Other States (the Convention), including Australia, New Zealand, the US, France and Malaysia. Written by Tatiana Minaeva, partner, and Ana Margetts, associate, at RPC.