State immunity — Enforcement and execution — Property of foreign State — Immunity from attachment — Mareva injunction restraining State from dealing with property pending decision of the court — Waiver of immunity — Whether sufficient to waive immunity from injunctive relief — State Immunity Act 1978, Section 13

Diplomatic relations — Immunity — Embassy property — Immunity from execution — Mareva injunction — Whether court may grant Mareva injunction in respect of property needed for functioning of diplomatic mission — Waiver — Whether waiver must be made in court — Vienna Convention on Diplomatic Relations, 1961, Articles 22 and 30 — Diplomatic Privileges Act 1964 — The law of England