We have received the following information from GB Customs Authorities concerning a scheduled maintenance.
The service will be unavailable from 9:30am CET on Tuesday 29th September 2026 until10am CET on Wednesday 30th September 2026.
During this maintenance window they will be refreshing the below data held in TDR, CDS Trader Dress Rehearsal:
Where applicable, aligning the CDS TDR environment to Production CDS 5.3.0 Release (which will take place on 26th September 2026). Refreshing Trader personal, account, and licensing data held in CDS TDR, using data which will be copied from Production on 29th September 2026. Refreshing UK/EU Tariff data held in CDS TDR, using data which has been copied from Production on 9th September 2026.
*Trader Dress Rehearsal is a sandbox environment and is regularly refreshed with Trader data and data from the Online Tariff on a given date, as such any CDS changes to Trader data in the live service or updates to the Online Tariff will not be reflected in TDR instantaneously. If you require assistance, please contact our Customer Support team via the ticket portal.
Kind Regards
Posted Sep 22, 2026 - 14:50 CEST
This scheduled maintenance affects: Great Britain.