https://www.nao.org.uk/wp-content/uploads/2017/07/The-Customs-Declaration-Service.pdf
https://www.socialeurope.eu/brexit-status-quo-ex-ante
https://ukandeu.ac.uk/universities-and-brexit-past-present-and-future/#
https://www.politico.eu/article/eu-uk-relations-rishi-sunak-brexit/