The freedom from legal proceedings in the UK that is granted to members of diplomatic missions of foreign states by the Diplomatic Privileges Act 1964. This Act incorporates some of the provisions of the Vienna Convention on Diplomatic Relations (1961), which governs diplomatic immunity in international law. The extent of the immunity depends upon the status of the member in question, as certified by the Secretary of State. If he is a member of the mission's diplomatic staff, he is entitled to complete criminal immunity and to civil immunity except for actions relating to certain private activities. A member of the administrative or technical staff has full criminal immunity, but his civil immunity relates only to acts performed in the course of his official duties. For domestic staff, both criminal and civil immunity are restricted to official duties. The so-called diplomatic bag is immune from search and seizure, as are the premises of the mission.
Similar immunities are granted to members of Commonwealth missions by the Diplomatic and other Privileges Act 1971, and to members of certain international bodies under the International Organisations Acts 1968 and 1981. Under the Diplomatic and Consular Premises Act 1987, the Secretary of State may remove diplomatic status from diplomatic or consular premises that are being misused.