http://www.wsta.co.uk/images/Brexit/Brexit_FINAL.pdf
https://blogs.sussex.ac.uk/uktpo/2018/02/15/sustainability-impact-assessment-for-post-brexit-britain/
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/637748/Future_customs_arrangements_-_a_future_partnership_paper.pdf
https://committees.parliament.uk/oralevidence/2766/pdf/