Following the United Kingdom's withdrawal from the EU you will not eligible to purchase/renew a .eu domain if you are a UK citizen/entity using a private/business UK address. However, if you are an EU citizen then you will be able to do so regardless of your location. The following guide is the official information provide by the UK Government - https://www.gov.uk/guidance/registering-and-renewing-eu-domain-names-in-the-uk
