https://www.gov.uk/government/news/pms-european-council-press-statement-20-october-2017
https://publications.parliament.uk/pa/cm200203/cmhansrd/vo021126/debtext/21126-17.htm
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/621848/60093_Cm9464_NSS_SDR_Web.pdf