https://www.publications.parliament.uk/pa/ld201617/ldselect/ldeucom/169/169.pdf
http://www.cer.org.uk/sites/default/files/insight_JS_9.5.17.pdf
http://www.standard.co.uk/news/politics/boris-johnson-backed-by-ukip-in-general-election-a3530371.html
https://www.opendemocracy.net/uk/anthony-barnett/englishman-scotswoman-and-irishman-talk-about-brexit?utm_source=Daily+Newsletter&utm_campaign=d6dd65c541-DAILY_NEWSLETTER_MAILCHIMP&utm_medium=email&utm_term=0_717bc5d86d-d6dd65c541-407405485