
http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.pdf

https://www.nao.org.uk/wp-content/uploads/2018/10/The-UK-border-preparedness-for-EU-exit.pdf

http://2ihmoy1d3v7630ar9h2rsglp-wpengine.netdna-ssl.com/wp-content/uploads/2019/09/190926-Brexit-and-the-Belfast-Good-Friday-Agreement-Final-report.pdf