State immunity — Jurisdictional immunity — State Immunity Act 1978 — Kurdistan Regional Government — Production Sharing Contract for oil and gas in the Kurdistan Region of Iraq — Consent to change in control of private company — Suit against constituent territories and separate entities — Whether a constituent territory of a recognized State entitled to immunity —Whether agents and servants of States, constituent territories of States and separate entities entitled to immunity — Acta jure imperii — Orders in Council under Section 14 of State Immunity Act 1978 — Sovereign authority under State Immunity Act 1978 — Constitution of State as source of sovereign authority — Pearl Petroleum Co. Ltd v. Kurdistan Regional Government of Iraq — Service on agents of States, constituent territories and separate entities — Doctrine of foreign act of State — Forum non conveniens — Stay of proceedings

States — Federal States — Constituent territories — Iraq — Kurdistan Region — Immunity — The law of England