16. In Part B of Section 3.1—
(a)in paragraph (b), after the words “related to” there shall be inserted the words “and carried on as part of”;
(b)at the end there shall be added the following paragraph—
“(c)The heating of calcium carbonate or calcium magnesium carbonate for the purpose of making lime where the process is not likely to involve the heating in any 12 month period of 5,000 tonnes or more of either substance or, in aggregate, of both.”.