http://www.legislation.gov.uk/id/eur/2015/2447

TITLE VIIIGOODS TAKEN OUT OF THE CUSTOMS TERRITORY OF THE UNION

CHAPTER 3 Export and re-export

Article 336Export or re-export declaration for goods in several consignments(Article 162 of the Code)

Where goods are intended to be taken out of the customs territory of the Union as more than one consignment each individual consignment shall be covered by a separate export or re-export declaration.