https://www.gov.uk/government/news/programme-for-fourth-round-of-uk-eu-article-50-negotiations
https://www.instituteforgovernment.org.uk/explainers/eu-withdrawal-bill-amendments-and-debates
http://blogs.lse.ac.uk/brexit/2017/09/28/the-eu-referendum-was-gerrymandered/
https://socialeurope.eu/brexit-why-does-northern-ireland-matter-so-much