4The repeal by this Act of paragraph 8 of Schedule 6 to the Iron and Steel Act 1975 shall not affect the application of the [1976 c. 34.] Restrictive Trade Practices Act 1976 in relation to any agreement which has not been registered in accordance with the provisions of that paragraph ; and the period within which particulars of the variation or determination of any agreement to which that paragraph applied are to be furnished in accordance with section 24(2) of the said Act of 1976 to the Director General of Fair Trading shall be the period of three months beginning with the date of the variation or determination.