Constitutional law – Foreign sovereign state. On the proper understanding of the customary international law concerning state immunity, so far as the State Immunity Act 1978 ss 4(2)(b) and 16(1)(a) conferred immunity, they were incompatible with art 6 of the European Convention on Human Rights and art 47 of the Charter of Fundamental Rights of the European Union. Accordingly, the Supreme Court held that those sections would not apply to the respondent embassy domestic workers' employment claims against Sudan and Libya derived from European Union law, and made a declaration of incompatibility.