http://www.europarl.europa.eu/RegData/etudes/STUD/2017/602028/IPOL_STU(2017)602028_EN.pdf
http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.pdf
https://www.nakedcapitalism.com/2018/02/another-brexit-mess-grandfathering-existing-free-trade-agreements-looks-unlikely.html
https://www.cbi.org.uk/media/4112/the-red-tape-challenge-final.pdf