http://www.europarl.europa.eu/cmsdata/115748/IPOL_IDA(2017)583130_EN.pdf
https://www.publications.parliament.uk/pa/cm201617/cmselect/cmwomeq/799/799.pdf
https://www.ifs.org.uk/publications/10302
http://www.esf.be/new/wp-content/uploads/2018/07/ESF-Press-Release-on-Importance-of-Services-Trade-in-EU-UK-Future-Relastionship.pdf