(1) The calculation of the multiplying factor referred to in Article 17 (2) (e) (i) of the Regulations of 1984 shall be based on the average period left to run on policies and on adjustments necessary to take account of premature termination of contracts.
(2) The multiplying factor need not, however, be calculated where it is shown to the satisfaction of the Minister that such factor would in any event be in excess of that necessary to generate an adequate implicit item to supplement the explicit elements referred to in Article 17 (2) (a) to (d) of the Regulations of 1984 for the purpose of meeting the requirements of Article 18 of those Regulations.