State immunity — Jurisdiction — Embassy premises — Attachment and execution — Government of Iran owning premises in London — Premises once used as Iranian Embassy — Articles 22 and 1(i) of Vienna Convention on Diplomatic Relations, 1961 — Convention acquiring force of law in United Kingdom by means of Diplomatic Privileges Act 1964 — Whether premises protected by State immunity — Service of process on foreign State — Whether Section 12(1) of State Immunity Act 1978 applicable — Whether to treat matter ex parte — Whether Court having power to dispense with service — Whether Court having jurisdiction to entertain reference

Diplomatic relations — Diplomatic immunity — Termination of relations between Iran and United Kingdom — Whether Section 12(1) of State Immunity Act 1978 applicable — The law of England