Using the Trader Dress Rehearsal service Find out how to use the Trader Dress Rehearsal service to help prepare for using the Customs Declaration Service to make declarations. From: Print this page The Trader Dress Rehearsal (TDR) service is a free, optional test system designed to help traders prepare for the live Customs Declaration Service. If you have authorised software you can trial making declarations in a simulated, production-like environment before using the real service. Declarations submitted in the test environment are not legal submissions. No financial payment is taken and your licence will not be affected. Getting access to the Trader Dress Rehearsal service