
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/677268/Letter_to_Business_Leaders__1_.pdf

http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6448&CESifoWP.search=+

http://www.cer.org.uk/sites/default/files/insight_js_st_9.6.17.pdf