http://www.europarl.europa.eu/cmsdata/115748/IPOL_IDA(2017)583130_EN.pdf
https://www.socialeurope.eu/brexit-can-be-stopped-but-the-window-of-opportunity-is-closing-fast
https://publications.parliament.uk/pa/cm201719/cmselect/cmfaff/780/780.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/682894/Draft_Text_for_Discussion_-_Implementation_Period__1_.pdf