43. For the purposes of this Regulation, every quantity of products referred to in the second paragraph of section 42 must be calculated,
(1) in the case of products referred to in paragraphs 1 and 2, in kilograms or equivalent volume;
(2) in the case of products referred to in paragraph 3, in kilograms based on empty containers or litres of an equivalent capacity.
That quantity must also be accompanied, for each subcategory and type of product, by the conversion factor in weight, equivalent volume or litres of an equivalent capacity, as the case may be, and by the methodology used to establish that factor.