
https://yougov.co.uk/news/2017/04/26/voting-intention-conservatives-45-labour-29-25-26-/

http://www.britishchambers.org.uk/press-office/press-releases/bcc-open-letter-to-pm-businesses-need-clarity-on-brexit.html

https://publications.parliament.uk/pa/cm201719/cmselect/cmworpen/848/848.pdf