
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_views-eu-27-v5_WEB.pdf

https://blogs.lse.ac.uk/brexit/2019/08/12/boris-johnsons-real-agenda-the-singapore-scenario/

http://www.icaew.com/-/media/corporate/files/technical/economy/brexit/eu-exit-charge.ashx