4. Notwithstanding paragraph 3, the United Kingdom may negotiate, sign and ratify, during the transitional period, international agreements concluded in its own capacity in areas falling within the exclusive competence of the Union, unless such agreements enter into force or apply during the transitional period, unless the Union has approved it. CONSIDERING that appropriate measures should be taken for the exemption and exemption from duties and taxes which the armed forces of the United Kingdom and associated personnel may maintain after the withdrawal of the United Kingdom from the Union, the Headquarters Agreement between the United Kingdom and the European Banking Authority of 8 The Exchange of Letters concerning the application of the Protocol on the Privileges and Immunities of the European Communities to the European Agency for the Evaluation of Medicinal Products of 24d uin 1996 in the United Kingdom and the agreement on the inclusion of the Galileo Security Oversight Body of 17 July 2013 shall apply. the European Banking Authority, the European Medicines Agency and the Security Supervisory Body Galileo until their transfer to a Member State is completed. The date of notification of the closure date of relocation by the Union shall be the date of the end of those hosting agreements. The most obvious assumption, at the time of negotiating the agreement, is that the joint accession of the UK and Ireland to the EU`s customs union and internal market would allow for a « borderless » Ireland. . . .