http://fedtrust.co.uk/brexitthe-conservative-centre-cannot-hold/
https://blogs.lse.ac.uk/brexit/2021/02/26/future-british-european-security-relations-are-a-matter-of-trust/
http://www.parliament.uk/documents/commons-committees/Exiting-the-European-Union/17-19/Cross-Whitehall-briefing/EU-Exit-Analysis-Cross-Whitehall-Briefing.pdf
https://www.publications.parliament.uk/pa/ld201617/ldselect/ldeucom/116/116.pdf