No relationship with Customs yet? Request an EORI number with them as soon as possible. Every company in Europe involved in import or export requires such a unique identification number. Also if you are an importer or exporter who uses a forwarder or customs agent for your import and export declarations. Please contact national customs as the application process may vary from country to country. Pay attention! Have you worked with a British EORI number until now? Because of the Brexit you have to convert this to an EORI number from the EU.