Article 93U.K.
Member States shall prohibit between themselves all customs duties on imports and exports or charges having equivalent effect, and all quantitative restrictions on imports and exports, in respect of:
products in List A1 and A2;
products in List B if subject to a Common Customs Tariff and accompanied by a certificate issued by the Commission stating that they are intended to be used for nuclear purposes.
Non European territories under the jurisdiction of a Member State may, however, continue to levy import and export duties or charges having equivalent effect where they are of an exclusively fiscal nature. The rates of such duties and charges and the system governing them shall not give rise to any discrimination between that State and the other Member States.