https://publications.parliament.uk/pa/ld201719/ldselect/ldeucom/15/15.pdf
https://waitingfortax.com/2017/05/29/sometimes-you-try-and-you-do-not-succeed/?cmpid=BBBXT053017_BIZ&utm_medium=email&utm_source=newsletter&utm_term=170530&utm_campaign=brexit
https://blogs.lse.ac.uk/brexit/2019/06/26/did-we-ever-really-understand-how-the-eu-works/
https://theconversation.com/why-the-eus-singapore-ruling-does-not-lead-to-a-smoother-brexit-road-for-britain-78116