Not true. the rules are not set by the EU - they are set by each country independently. For example, VAT is not the same across the EU. and import taxes and tarifs are defined by each country.The rules on tariffs, tax and so on within the EU are set by the EU, given their single market and customs union, not by the couriers and postal services. Whatever your point of view of the EU, it does have a history of being rather protectionist, and it does have a vested interest in making life for the UK as tricky as possible to dissuade other countries from leaving.