Diplomatic relations — Diplomatic immunity — Purchase by ambassador of shares of company owning residential property — Purchase price of shares unpaid — Whether company entitled to eviction order against ambassador — Ambassador claiming that property acquired for carrying out diplomatic functions — Whether ambassador entitled to jurisdictional immunity — Vienna Convention on Diplomatic Relations, 1961 — Article 31(1) (a) — Scope — Exception from immunity of diplomatic agent’s “private property” — Whether ambassador’s acquisition falling within exception — Recognition of diplomatic premises — Whether requirements of Diplomatic Immunities and Privileges Act 1989 complied with — The law of South Africa