5.—(1) Subject to the other terms of this Order, including the requirements, the undertaker may maintain the authorised development, except to the extent that an agreement made under this Order provides otherwise.
(2) Subject to paragraph (3) and the requirements, the power to maintain the authorised development includes the power to carry out and maintain such of the following as may be necessary or expedient for the purposes of, or for purposes ancillary to, the construction or operation of the authorised development, namely—
(a)works to alter the position of apparatus below ground level, including mains, sewers, drains and cables including below ground structures associated with that apparatus within the Order limits;
(b)works of decommissioning and demolition.
(3) This article only authorises the carrying out of maintenance of works within the Order limits.