http://fedtrust.co.uk/our-work-on-europe/hard-brexit-international-trade-and-the-wto-scenario/
https://mostfavourednation.substack.com/p/a-veterinary-agreement
http://www.sussex.ac.uk/spru/newsandevents/2017/publications/food-brexit
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/695321/An_inspection_of_exit_checks.pdf