https://cer.org.uk/sites/default/files/bulletin_114_js_st_article1.pdf
http://ukandeu.ac.uk/an-utterly-pernicious-bill/
https://ec.europa.eu/commission/sites/beta-political/files/financial-settlement-essential-principles-draft-position-paper_en.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmbeis/379/379.pdf