
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/

https://publications.parliament.uk/pa/cm201719/cmselect/cmcumeds/365/36503.htm

http://www.conservativehome.com/parliament/2016/04/theresa-mays-speech-on-brexit-full-text.html