Report a problem using the Customs Declaration Service.
HMRC provides an online form for importers, exporters, and their agents to report technical issues encountered when using the Customs Declaration Service. The online reporting form will be unavailable due to scheduled maintenance from 8pm on Friday 18 September 2026 until 6pm on Sunday 20 September 2026. During this maintenance period, urgent enquiries should be sent via email to cds.operations@hmrc.gov.uk including specific business and movement details.
Source: https://www.gov.uk/guidance/report-a-problem-using-the-customs-declaration-service. Summarised automatically from the official source — general information, not advice.