http://www.epc.eu/documents/uploads/pub_7865_realitybites.pdf
https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf
https://ukandeu.ac.uk/energy-security-and-industrial-strategy-uk-and-eu-divergence/
https://www.spiegel.de/politik/ausland/brexit-deutscher-ex-botschafter-warnt-vor-zu-selbstgefaelligem-blick-auf-grossbritannien-a-0e50fbd5-de82-4b1a-b7cc-eef28f56577c