https://publications.parliament.uk/pa/cm201719/cmselect/cmhaff/421/421.pdf
https://yougov.co.uk/news/2017/08/01/britain-nation-brexit-extremists/
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/637748/Future_customs_arrangements_-_a_future_partnership_paper.pdf
http://ukandeu.ac.uk/wp-content/uploads/2017/06/One-year-on.pdf