State immunity — Jurisdictional immunity — Foreign State — Principles of sovereign immunity — Indian citizen seeking to sue Embassy of Algeria — Requirement that Indian Government give permission to sue foreign State — Permission refused allegedly on political grounds and because no prima facie case made out — Whether power exercised arbitrarily — United Kingdom State Immunity Act 1978 — European Convention on State Immunity, 1972 — Whether giving guidance on content of international law — Whether national law to conform to the constitutional rights guaranteed in the Constitution — The law of India