https://publications.parliament.uk/pa/cm201719/cmselect/cmniaf/329/329.pdf
http://www.standard.co.uk/news/politics/boris-johnson-backed-by-ukip-in-general-election-a3530371.html
https://www.gov.uk/government/news/pms-open-letter-to-eu-citizens-in-the-uk
http://www.wsta.co.uk/images/Brexit/Brexit_FINAL.pdf