18.—(1) Where a person —
(a)undertakes, without a permit, works for which a permit is required to have been obtained; or
(b)breaches any condition of a permit;
the Permit Authority may by notice require that person to take such reasonable steps as are specified in the notice, which may include steps to remove the works, to remedy the breach or to minimise or discontinue any obstruction to the street connected with the works.
(2) The notice must specify the works or breach falling within paragraph (1)(a) or (b) to which it relates.
(3) If a statutory undertaker fails to comply with such a notice within such reasonable period as is specified in the notice, the Permit Authority may take the steps specified in the notice and such reasonable steps as it considers appropriate having regard to the works or breach falling within paragraph (1)(a) or (b) to which the notice relates and recover from the statutory undertaker the costs reasonably incurred by it in doing so.