Relationship of international law and municipal law — International agreements — Customary international law — Agreement between the United Kingdom and Morocco — The law of the United Kingdom — Justiciability of decision to enter into international agreements — Dualism — Whether customary international law can be relied upon to challenge legislation — Statutory interpretation — Role of international law in interpreting statute — Role of international law in interpreting statute that mirrors an international agreement — Foreign act of State doctrine
Sources of international law — Customary international law — Jus cogens norms — Whether the right to self-determination a jus cogens norm — Principle of pacta tertiis nec nocent nec prosunt — Whether principle applicable to Non-Self-Governing Territories
Territory — Non-Self-Governing Territory — Western Sahara — Morocco’s presence in Western Sahara — Agreement between the United Kingdom and Morocco — Whether agreement between the United Kingdom and Morocco violated international law
Treaties — Interpretation — Vienna Convention on the Law of Treaties, 1969 — Article 31(1) — Interpretation — Ordinary Meaning — Article 31(3)(c) — Role of other relevant rules of international law to the interpretative exercise — Article 53 — Article 71 — Peremptory norms of international law — Impact of peremptory norms of the interpretation of a treaty — Identification of peremptory norms — Whether the right to self-determination a jus cogens norm — The law of England