https://publications.parliament.uk/pa/cm201719/cmselect/cmworpen/848/848.pdf
https://ec.europa.eu/commission/sites/beta-political/files/slides_on_uk_technical_note_on_temporary_customs_arrangements.pdf
http://www.acea.be/uploads/publications/ACEA_position_paper-Brexit.pdf
https://committees.parliament.uk/publications/30492/documents/175947/default/