
https://blogs.lse.ac.uk/brexit/2021/01/11/article-16-of-the-ireland-northern-ireland-protocol-offers-no-quick-fix/

https://publications.parliament.uk/pa/cm201719/cmselect/cmsctech/705/70503.htm#_idTextAnchor001

http://www.independent.co.uk/news/uk/politics/brexit-workers-rights-european-court-of-justice-ruling-conley-king-ecj-gig-economy-eu-a8082801.html