Where the order comes into operation for the said purposes between 31st October and 1st January, then as soon as may be after the coming into operation of the order, and in any case before the expiration of 28 days, the British Gas Corporation shall transmit to the rating authorities of the rating areas and to the valuation officer for such areas the statements which would have been required by paragraph 7 of the said Schedule 6 to have been transmitted before 31st October if the order had come into operation on 1st April, and as soon as may be after receiving such statements the valuation officer shall calculate the rateable values of any hereditaments which the Corporation are to be treated as occupying in the rating areas during any rate period consisting or forming part of the year commencing on the appointed day, and shall notify the amounts so calculated to the rating authorities aforesaid, and—