Where Work Nos. 1(a) to (f) or Work No. 2 or any part of those works is abandoned or allowed to fall into decay the Secretary of State may, following consultation with the undertaker, issue a written notice requiring the undertaker at its own expense to repair and restore or remove Work Nos. 1(a) to (f) or Work No. 2 or any relevant part of those works and, without prejudice to any notice served under section 105(2) of the 2004 Act42, to restore the site of the relevant part(s) of Work Nos. 1(a) to (f) or Work No. 2 to a safe and proper condition within an area and to such an extent as may be specified in the notice.