5.—(1) When signifying approval of the plans of any relevant work, the engineer may specify any protective works (whether temporary or permanent) which the engineer reasonably considers should be carried out before the commencement of the relevant work to ensure the safety or stability of railway property and the continued safe and efficient operation of the railways of Network Rail or the services of operators using those railways; and such protective works may include any relocation of works, apparatus and equipment necessitated by the relevant work.
(2) Any such protective works must be constructed by Network Rail or by the undertaker, if Network Rail so desires, with all reasonable dispatch; and the undertaker must not commence the construction of the relevant work until the engineer has notified the undertaker that the protective works have been completed to the engineer’s reasonable satisfaction.