https://blogs.lse.ac.uk/brexit/2019/08/12/boris-johnsons-real-agenda-the-singapore-scenario/
https://www.niauk.org/media-centre/blog/uk-explore-retaining-membership-euratom/
http://europa.eu/rapid/press-release_IP-18-463_en.htm
https://publications.parliament.uk/pa/bills/cbill/58-03/0204/220204.pdf