‘The United Kingdom shall be entitled, notwithstanding Articles 26 and 77 of the Treaty on the Functioning of the European Union, any other provision of that Treaty or of the Treaty on European Union, any measure adopted under those Treaties, or any international agreement concluded by the Union or by the Union and its Member States with one or more third States, to exercise at its frontiers with other Member States such controls on persons seeking to enter the United Kingdom as it may consider necessary for the purpose:
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of verifying the right to enter the United Kingdom of citizens of Member States and of their dependants exercising rights conferred by Union law, as well as citizens of other States on whom such rights have been conferred by an agreement by which the United Kingdom is bound; and
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of determining whether or not to grant other persons permission to enter the United Kingdom.