No treaty, but a referendum on whether or not to join the EEC was held in the UK.
The Treaty of Brussels.
Maastricht Treaty
Yes. Australia holds an extradition treaty signed with USA. The treaty was signed at Washington on May 14, 1974. The treaty came into force on May 8, 1976. The ratification was advised by the Senate of the United States of America on December 1, 1975 and it was ratified by the President of the United States of America December 16, 1975. The treaty was ratified by Australia on December 22, 1975 and ratifications were exchanged at Canberra on April 8, 1976. Please refer link in sources for the complete treaty document. Hope this helps.
The Treaty of the European Union, or the Maastricht Treaty
The Treaty of Maastricht
The Treaty of Paris was signed in Paris because France created the treaty and it was signed in Paris.
They are a member of the EU and the Schengen Treaty.
The treaty was signed in 1959.
The Treaty on the European Union or the Maastricht Treaty
The Lisbon Treaty.
The Maastricht Treaty.
Not with the whole EU but only with some of the EU Member States.