
https://www.tuc.org.uk/sites/default/files/Brexit%20Legal%20Opinion.pdf

https://www.greatbritishpolitics.co.uk/europe/654-dual-nationality-and-the-hurdles-facing-britons-who-want-to-keep-eu-citizenship-after-brexit.html

https://www.nao.org.uk/wp-content/uploads/2018/01/PFI-and-PF2.pdf