http://www.nhsconfed.org/-/media/Confederation/Files/public-access/Securing-the-future.pdf?dl=1
https://publications.parliament.uk/pa/cm200203/cmhansrd/vo021126/debtext/21126-17.htm
https://blogs.sussex.ac.uk/uktpo/2018/12/17/organising-the-second-referendum/
http://cdn.budgetresponsibility.org.uk/July_2017_Fiscal_risks.pdf