https://www.socialeurope.eu/brexit-can-be-stopped-but-the-window-of-opportunity-is-closing-fast
https://institute.global/news/customs-and-exiting-european-union
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/723460/CHEQUERS_STATEMENT_-_FINAL.PDF
https://visual.ons.gov.uk/commonwealth-trade-in-focus-as-uk-prepares-for-brexit/