Not less than 56 days before commencing to carry out any work authorised by this Act which is near to, or will or may affect, any apparatus the removal of which has not been required by the appropriate authority under paragraph 4 above, the appropriate authority shall submit to the undertakers a plan, section and description of the work to be carried out.

The work shall be carried out in accordance with the plan, section and description submitted as aforesaid and in accordance with such reasonable requirements as may be made by the undertakers for the alteration or otherwise for the protection of the apparatus, or for securing access thereto, and the undertakers shall be entitled by their officer to watch and inspect the carrying out of the work.

If the undertakers, within 28 days after the submission to them of any such plan, section and description, shall, in consequence of the work proposed by the appropriate authority, reasonably require the removal of any apparatus and give written notice to the appropriate authority of that requirement, the foregoing provisions of this Part of this Schedule shall have effect as if the removal of such apparatus had been required by the appropriate authority under paragraph 4 above.

Nothing in sub-paragraphs (1) to (3) above shall preclude the appropriate authority from submitting at any time, or from time to time, but in no case less than 28 days before commencing to carry out the work, a new plan, section and description thereof instead of the plan, section and description previously submitted, and thereupon the provisions of those sub-paragraphs shall apply to, and in respect of, that new plan, section and description.

The appropriate authority shall not be required to comply with sub-paragraphs (1) to (3) above in a case of emergency but in such a case they shall give notice to the undertakers so soon as reasonably practicable and a plan, section and description of the works so soon as reasonably practicable thereafter, and shall otherwise comply with those sub-paragraphs so far as reasonably practicable in the circumstances.