If the nominated undertaker gives notice in writing to the undertakers that it desires to carry out any part of so much of the work necessary in connection with the construction of the alternative apparatus, or the removal of the apparatus required to be removed, as is or will be situate in any lands held or used, or intended for use, by the nominated undertaker for the purposes of its undertaking under this Act or held by the Secretary of State, such work, instead of being carried out by the undertakers, shall be carried out by the nominated undertaker in accordance with plans and specifications and in a position agreed between the undertakers and the nominated undertaker, or, in default of agreement, determined in accordance with paragraph 13, with all reasonable despatch under the superintendence (if given) and to the reasonable satisfaction of the undertakers.

Nothing in this paragraph shall authorise the nominated undertaker to carry out any connection to or disconnection of any existing apparatus or to carry out any works associated with a connection or disconnection within 600 millimetres of the point of connection or disconnection.