Yes, after Brexit an EORI number is essential for customs operations with the UK. Two types exist: GB EORI (format: GB + 12 digits) for UK customs clearance and the Customs Declaration Service (CDS); EU EORI (separate registration in any EU member state) for EU customs operations. The GVMS (Goods Vehicle Movement Service) system is mandatory for goods vehicles entering the UK through enabled ports. Entry Summary Declarations are required from 2025. The TCA EU-UK agreement provides zero tariffs and zero quotas for goods meeting rules of origin. The BTOM (Border Target Operating Model) defines new UK border controls from 2024.