Home » Outages » TDR (Trader Dress Rehearsal) Planned Downtime

TDR (Trader Dress Rehearsal) Planned Downtime

Historic - 08:00, 7th July 2026 - 08:00, 8th July 2026

Albacore have been advised HMRC will be completing a maintenance update to the CDS Trader Dress Rehearsal (TDR) service. The outage will start from 09:00 hrs, 07th July until 09:00 hrs BST on 08th July 2026. During this maintenance HMRC will be refreshing the following data in TDR: Where applicable, aligning the CDS TDR environment to Production CDS 5.2.0 Release (which will take place on 04th July 2026). Refreshing Trader personal, account, and licensing data held in CDS TDR, using data which will be copied from Production on 07th July 2026. Refreshing UK/EU Tariff data held in CDS TDR, using data which has been copied from Production on 17th June 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. There will be a complete outage during this period. Please can you inform your contacts.

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