Prospective
5. By way of exception to paragraph 4(a), any amount referred to in paragraph 2(c), 3(a) or 3(b) may be expressed as a percentage by weight, unless the amount is less than 0.1% by weight, in which case it shall be expressed in milligrams per kilogram or micrograms per kilogram as appropriate.
Commencement Information
I1Sch. 3 para. 5 in force at 1.1.2006, see reg. 1(1)