https://www.gov.uk/government/news/pms-open-letter-to-eu-citizens-in-the-uk
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/621848/60093_Cm9464_NSS_SDR_Web.pdf
https://www.bankofengland.co.uk/-/media/boe/files/report/2018/eu-withdrawal-scenarios-and-monetary-and-financial-stability.pdf?la=en&hash=B5F6EDCDF90DCC10286FC0BC599D94CAB8735DFB
https://ec.europa.eu/commission/sites/beta-political/files/seminar-20200114-lpf_en.pdf