
http://fedtrust.co.uk/views-from-the-federal-trust/free-movement-and-migration/

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/680185/Governor_letter_to_CX_-_Feb_2018.pdf

https://policyscotland.gla.ac.uk/blog-sir-ivan-rogers-speech-text-in-full/