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

https://www.bloomberg.com/news/articles/2019-09-11/world-s-oldest-customs-union-and-u-k-reach-a-post-brexit-deal

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1052148/benefits-of-brexit-document.pdf