Full Powers is a term in international law and is the authority of a person to sign a treaty or convention on behalf of a sovereign state. Persons other than the head of state, head of government or foreign minister of the state must produce Full Powers in order to sign a treaty binding their government. Such a person is called a plenipotentiary. This article or section is in need of attention from an expert on the subject. ... Single European Act A treaty is a binding agreement under international law entered into by actors in international law, namely states and international organizations. ... Convention has at least two very distinct but related meanings. ... This article discusses states as sovereign political entities. ... Queen Elizabeth II, is the Head of State of 16 countries including: the United Kingdom, Canada, Australia, Jamaica, New Zealand and the Bahamas, as well as crown colonies and overseas territories of the United Kingdom. ... The Head of Government is the chief officer of the executive branch of a government, often presiding over a cabinet. ... A minister for foreign affairs, or foreign minister, is a governmental cabinet minister who helps form the foreign policy of a sovereign nation. ... The term plenipotentiary (from the Latin, plenus + potens, full + power) refers to, as a noun, a person who has, or as an adjective that confers, full powers. ...

References

• Explanation of Full Powers on the United Kingdom's Foreign and Commonwealth Office website