https://www.gov.uk/government/news/programme-for-fourth-round-of-uk-eu-article-50-negotiations
https://www.socialeurope.eu/2017/06/britains-deepening-confusion/
https://institute.global/sites/default/files/2020-07/Tony%20Blair%20Institute%2C%20A%20Path%20to%20Brexit%20Agreement%2C%20July%202020.pdf
https://publications.parliament.uk/pa/bills/cbill/58-03/0204/220204.pdf