http://www.sussex.ac.uk/spru/newsandevents/2017/publications/food-brexit
http://visual.ons.gov.uk/trading-places-uk-goods-trade-with-eu-partners/
http://blogs.lse.ac.uk/brexit/2017/07/06/the-1bn-bung-wont-protect-northern-ireland-from-the-pain-of-a-hard-brexit/
https://www.iwh-halle.de/fileadmin/user_upload/publications/iwh_discussion_papers/iwh-discussion-paper_2019-04_Brautzsch_Holtemoeller.pdf