https://ec.europa.eu/commission/sites/beta-political/files/joint_report.pdf
https://economy2030.resolutionfoundation.org/wp-content/uploads/2023/06/Trading-Up.pdf
http://cep.lse.ac.uk/pubs/download/brexit11.pdf
https://publiclawforeveryone.com/2017/06/10/does-the-salisbury-convention-apply-during-a-hung-parliament/