http://www.cer.org.uk/sites/default/files/insight_js_st_9.6.17.pdf
https://www.esri.ie/system/files/publications/SUSTAT117.pdf
https://www.theguardian.com/politics/2017/sep/04/uk-trade-deals-after-brexit-theresa-may-eu
http://fedtrust.co.uk/mrs-may-in-florence/