6.—(1) A distiller receiving approval under regulation 4 above shall ensure that any plant or process so approved is not [F1significantly] varied, altered or changed unless the variation, alteration or change is first approved by the Commissioners, and any such approval may be given subject to conditions.
(2) Application for the approval of any variation, alteration or change to any plant or process shall be in such form and manner and shall provide such details, including a written description, drawing or model, as the Commissioners may require.
(3) The Commissioners may for reasonable cause at any time vary or add to any conditions imposed on the approval of any variation, alteration or change of any plant or process, or withdraw any such approval.