9. The promoter shall, if it is practicable to do so, afford to the specified undertaker the necessary rights and facilities for the construction of any necessary alternative apparatus in other land which is available for the purpose and which is held or used, or intended for use, by the promoter for the purpose of its undertaking under this Order or in which it has sufficient rights or interests and thereafter for the use, maintenance and renewal of such apparatus and, if the promoter is unable to obtain those rights and facilities, the specified undertaker shall, on receipt of a written notice to that effect from the promoter, use its best endeavours to obtain the necessary rights and facilities.