
https://www.smmt.co.uk/wp-content/uploads/sites/2/1207-SMMT-position-on-UK-Brexit-negotiations.pdf

https://www.bloomberg.com/opinion/articles/2020-12-18/britain-and-europe-s-fish-fight-reveals-ultimate-brexit-truths

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/899991/200713_BPDG_-_Border_Operating_Model_FINAL_1320_edit.pdf