http://www.legislation.gov.uk/ukla/1992/3/section/8/enactedLondon Underground Act 1992Ancient monumentsKing's Printer of Acts of Parliament2021-07-30 Part II 8 Before breaking up or otherwise interfering with any street to which the public has access in connection with the construction of any of the works the Company shall (except in case of emergency) give not less than 14 days' notice in writing to— a the London Fire and Civil Defence Authority; and b the chief officer of police; and make such arrangements with the chief officer of police as may be reasonably necessary so as to cause as little interference with the traffic in such street during the construction of such works as may be reasonably practicable.