Essential Cases: Public Law provides a bridge between course textbooks and key case judgments. This case document summarizes the facts and decision in R (on the application of Abbasi v Secretary of State for Foreign and Commonwealth Affairs and Secretary of State for the Home Department [2002] EWCA Civ 1598, before the Court of Appeal. This case concerned, among other things, whether foreign policy decisions made by the executive under the prerogative power could ever constitute justiciable matters arguable before the courts. The document also includes supporting commentary from author Thomas Webb.