
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/728135/THE_FUTURE_UK-EU_RELATIONSHIP.pdf

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/621848/60093_Cm9464_NSS_SDR_Web.pdf

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/637748/Future_customs_arrangements_-_a_future_partnership_paper.pdf