HMRC will begin a phased launch of the customs declaration service (CDS) in August, with all declarations taking place on the CDS from early next year. It will replace the customs handling of import and export freight (CHIEF) system.
The CDS will be scaled to handle potential increases in the volume of declarations that may result from Brexit.
The service will be accessed on GOV.UK using a government gateway account.
For more information, see here.