9E+WAn amount which apart from this paragraph would be payable to undertakers in respect of works of their by virtue of paragraph 6 above (and having regard, where relevant, to paragraph 7 above) shall, if the works include the placing of apparatus provided in substitution for apparatus placed more than 7½ years earlier so as to confer on the undertakers any financial benefit by deferment of the time for renewal of the apparatus in the ordinary course, be reduced by the amount which represents that benefit.