https://theconversation.com/eu-citizens-proposal-a-lawyer-examines-the-detail-80111
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/831199/20190802_Latest_Yellowhammer_Planning_assumptions_CDL.pdf
http://europa.eu/rapid/press-release_IP-18-463_en.htm
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/621848/60093_Cm9464_NSS_SDR_Web.pdf