好像英国本土卖家不需要这个IEN 的, I am a UK-based or EU-based seller. Does this affect me? Amazon is only required to maintain records in respect of non-EU sellers. That means that the regulation only affects sellers that do not have a registered business established in either the UK or an EU country (full list of EU countries here). If you have an established business in the EU, you are not affected by this requirement.