International organizations — Immunity — Nature of immunity of international organizations — Whether comparable to State immunity — Waiver — Whether immunity can be waived by general anticipatory waiver in contract — International Tin Council — ITC-United Kingdom Headquarters Agreement, 1972 — International Tin Council (Immunities and Privileges) Order 1972

Relationship of international law and municipal law — Treaties — Interpretation by municipal courts — Reference to other treaties as aid to interpretation — Whether permissible — Practice of other States — Need for courts to keep in step with practice of other States — The law of England