4. (1) The regulations specified in the First Schedule are hereby revoked.

(2) Notwithstanding sub-article (1), the regulations referred to in the First Schedule shall, subject to the provisions of those regulations, continue to apply to works, or a building as regards which a material change of use takes place, where—

(a) the works commence or the material change of use takes place before the date referred to in article 2, or

(b) the works or building fall within the description contained in article 3(2).