http://fedtrust.co.uk/the-2017-general-election-a-mandate-for-brexit/
https://www.gov.uk/government/news/david-davis-closing-remarks-at-the-end-of-the-fourth-round-of-eu-exit-negotiations-in-brussels
http://europa.eu/rapid/press-release_IP-18-463_en.htm
http://blogs.lse.ac.uk/brexit/2017/12/05/a-high-risk-game-of-chicken-is-being-played-over-the-irish-border/