https://publications.parliament.uk/pa/ld201719/ldselect/ldconst/69/69.pdf
http://www.cer.org.uk/sites/default/files/insight_js_st_9.6.17.pdf
http://blogs.lse.ac.uk/brexit/2017/12/05/a-high-risk-game-of-chicken-is-being-played-over-the-irish-border/
https://www.britishcouncil.org/sites/default/files/the_value_of_trust.pdf