4. In fruit juice, concentrated fruit juice, fruit juice from concentrate, and dehydrated or powdered fruit juice, other than any prepared from grapes or pears, sugars may be added–
(a)for the purpose of regulating acidic taste, in an amount (expressed as dry matter) not exceeding 15 g per litre of the juice;
(b)for the purpose of sweetening, in an amount (expressed as dry matter) not exceeding 150 g per litre of the juice,
provided that the total amount of such added sugars for either purpose does not exceed 150 g per litre of the juice.