
https://www.gov.uk/guidance/status-of-eu-nationals-in-the-uk-what-you-need-to-know

https://www.politico.eu/article/gert-jan-koopman-top-eu-official-helps-run-a-luxury-hotel-in-bali-and-never-had-to-tell-brussels/

https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_Brexit_Euro_Court_Justice_WEB.pdf