3.—(1) Subject to the provisions of this regulation, local authorities, the National Assembly, the Commissioners and the Wine Standards Board are hereby designated as the authorities responsible for ensuring compliance with the Community provisions.
(2) Each local authority shall secure the enforcement and execution of the relevant Community provisions in so far as they relate to the retail sale of products within its area.
(3) The National Assembly, the Commissioners and the Wine Standards Board shall secure the enforcement and execution of the relevant Community provisions in so far as they relate to the importation and exportation of any wine-sector product into Wales from a third country or from Wales to a third country.
(4) The National Assembly and the Wine Standards Board shall secure the enforcement and execution of the relevant Community provisions in so far as they relate to any matter not mentioned in paragraphs (2) or (3) above.
(5) Nothing in this regulation shall be taken as authorising the Wine Standards Board or the Commissioners to institute proceedings for an offence.