4. Where there is more than one unlisted active substance in a biocidal product, these Regulations shall not apply to that biocidal product until a decision referred to in paragraph 2 is made in relation to the last of those unlisted active substances to be considered for inclusion in Annex I, IA or IB, provided that such a decision has been made to include all the other active substances in that biocidal product in either Annex I, IA or IB.