In consideration of the payment of an additional premium which is included in the premium hereon it is hereby agreed and declared that subject to the conditions of the policy loss. as insured by this policy resulting from interruption of or interference with the business in consequence of damage (As within defined) to property at any electricity station or substation, gas works or water works of the public supply undertaking from which the insured obtains electric current, gas or water shall be deemed to be loss resulting from damage to property used by the insured at the premises.
