https://www.gov.uk/government/news/programme-for-fourth-round-of-uk-eu-article-50-negotiations
http://blogs.lse.ac.uk/politicsandpolicy/john-mills-ge2017/
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/643924/Foreign_policy__defence_and_development_paper.pdf
https://publications.parliament.uk/pa/ld201719/ldselect/ldconst/69/69.pdf