http://carnegieeurope.eu/2017/06/15/bringing-brexit-back-to-reality-pub-71262
https://publications.parliament.uk/pa/cm201719/cmselect/cmexeu/1778/1778.pdf
https://www.ft.com/content/ed91e91a-87f2-11e7-8bb1-5ba57d47eff7
https://blogs.lse.ac.uk/brexit/2019/08/12/boris-johnsons-real-agenda-the-singapore-scenario/