Nothing in section 8 of this Act shall prevent any of the units of measurement mentioned in sub-paragraph (2) below being used for products or equipment which were placed on the market or used before 1st December 1980, other than weighing or measuring equipment (including weights).

The units of measurement referred to in sub-paragraph (1) above are the chain, furlong, rood, square mile, square inch, cubic yard, cubic foot, cubic inch, ton, hundredweight, cental, quarter, stone, dram, grain and quintal.