
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/397079/Scotland_EnduringSettlement_acc.pdf

https://publications.parliament.uk/pa/bills/cbill/2019-2020/0007/20007.pdf

https://www.nao.org.uk/wp-content/uploads/2017/07/The-Customs-Declaration-Service.pdf