https://publications.parliament.uk/pa/cm201719/cmselect/cmhaff/421/421.pdf
https://www.gov.uk/government/news/pms-open-letter-to-eu-citizens-in-the-uk
https://hansard.parliament.uk/commons/2018-03-07/debates/65828E0C-3CC7-43AE-B5D2-B5F1B5D42A4C/EuropeanUnionCitizenship
http://www.fdf.org.uk/news.aspx?article=7834