https://publications.parliament.uk/pa/cm201719/cmselect/cmniaf/329/329.pdf
https://ec.europa.eu/commission/presscorner/api/files/attachment/867751/NA0620220ENN_002.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/637748/Future_customs_arrangements_-_a_future_partnership_paper.pdf
https://lif.blob.core.windows.net/lif/docs/default-source/default-library/170427-final-trade-blueprintweb.pdf?sfvrsn=0