These Regulations require temporary storage facilities (transit sheds), airport examination stations and approved wharves to provide the amenities necessary for the conduct there of import and export customs formalities and other controls. These are binding conditions of their approval as such if given by HM Revenue and Customs after the United Kingdom exits the European Union.
Link: The Wharves, Examination Stations and Temporary Storage Facilities (Approval Conditions) (EU Exit) Regulations 2018
Source: Legislation .gov.uk