The European Union Act 2011 (Commencement No. 1) Order 2011
Article 2 of this order brings into force, on 19th August 2011, Part 1 of, and Schedule 1 to, the European Union Act 2011, which is to do with restrictions on treaties and decisions relating to the EU. Part 1 provides for three types of control in the UK before the Government can ratify or approve a treaty or decision that amends or replaces the Treaty of the European Union (TEU) or the Treaty on the Functioning of the European Union (TFEU), or approve certain decisions specified in the existing TEU or TFEU. The three types of control under Part 1 are:primary legislation and a national referendum in cases where a treaty or a decision has the effect of conferring further competence or power from the UK to the European Union;primary legislation; andan affirmative vote in both Houses of Parliament.