Relationship of international law and municipal law — Customary international law — Whether breach of United Kingdom’s international obligations — Compliance by United Kingdom Government — Role of domestic courts — Justiciability — Conduct of foreign affairs — Rule of non-justiciability of high policy matters — Institutional competence — Comity — Elected representatives in democracy — Whether for domestic courts to decide appropriate foreign policy towards Israel — Whether claimant having standing to bring claim — The law of England