
https://committees.parliament.uk/publications/30492/documents/175947/default/

http://www.cer.eu/sites/default/files/pb_ireland_brexit_6.7.17.pdf

https://blogs.lse.ac.uk/brexit/2021/02/04/indyref2-scottish-independence-would-be-2-3-times-more-costly-than-that-of-brexit-and-rejoining-the-eu-wouldnt-make-up-the-difference/