https://blogs.lse.ac.uk/brexit/2019/10/23/long-read-the-makings-of-brexit-and-the-road-ahead/
http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf
http://www.icaew.com/-/media/corporate/files/technical/economy/brexit/eu-exit-charge.ashx
https://ukandeu.ac.uk/post-global-britain-a-new-normal-in-uk-foreign-policy/?mc_cid=a36ff76330&mc_eid=815b1928ec