Where an application is made to any relevant undertaker for a consent for the purposes of section 175 above, the undertaker—
On such an application a relevant undertaker shall not refuse its consent, or impose any such condition as is mentioned in subsection (1)(b) above, unless it is reasonable to do so.
Where any relevant undertaker has given a notice to any person imposing any such condition as is mentioned in subsection (1)(b) above, the undertaker—
Any dispute between a relevant undertaker and any other person (including another such undertaker)—
shall be referred to the arbitration of a single arbitrator appointed by agreement between the undertaker and that person or, in default of agreement, by the Authority.
Subsection (3) above shall not apply where the person who was given the notice notifies the undertaker that the carrying out of the works to which the condition relates is no longer required.