https://www.gov.uk/government/publications/information-about-the-withdrawal-bill
http://www.britishchambers.org.uk/press-office/press-releases/bcc-no-deal-not-an-option-for-business-communities.html
http://www.icaew.com/-/media/corporate/files/technical/economy/brexit/eu-exit-charge.ashx
https://ec.europa.eu/commission/publications/terms-reference-article-50-treaty-european-union-negotiations_en