4.—(1) This regulation applies to a substance, mixture or preparation within the meaning of regulation 3 of the Hazardous Substances Regulations, described in a hazardous substances consent granted (or deemed to be granted) before the coming into force of these Regulations where—
(a)the description of that substance, mixture or preparation in column 1 of Part A or Part B of Schedule 1 to the Hazardous Substances Regulations as it exists before the coming into force of these Regulations will be amended as a result of the coming into force of these Regulations; and
(b)the hazardous substances consent is extant in relation to the substance, mixture or preparation concerned immediately before the coming into force of these Regulations.
(2) As regards a substance, mixture or preparation to which this regulation applies, the amendments made by these Regulations may be disregarded in construing the hazardous substances consent in so far as it relates to that substance, mixture or preparation or its controlled quantity.
(3) Paragraph (2) ceases to apply where the hazardous substances consent in relation to that substance, mixture or preparation or its controlled quantity is modified by the hazardous substances authority on or after the 19 March 2010.