8.—In Part III of the Act of 1939 and Part IV of the Act of 1952, any reference to premises shall, in a case in which there is both a main building used or intended to be used to provide accommodation or service for guests and one or more annexes or other supplementary structures to the main building used or intended to be used to provide such accommodation or service, be construed as including both a reference to the main building and a reference to such one or more annexes or supplementary structures.