(a) at any time before or during the construction in the vicinity of a building of any part of the authorised works; or 

(b) after the completion of the construction of that part of the authorised works in the vicinity of a building at any time up to the end of the period of 5 years beginning with the day on which that part of the authorised works is first opened for use. 

(3) For the purpose of determining how the functions under this article are to be exercised Network Rail may (subject to paragraph (5)) enter and survey any building falling within paragraph (1) and any land within its curtilage. 

(4) For the purpose of carrying out protective works under this article to a building Network Rail may (subject to paragraphs (5) and (6))— 

(a) enter the building and any land within its curtilage; and 

(b) where the works cannot be carried out reasonably conveniently without entering land which is adjacent to a building but outside its curtilage, enter the adjacent land (but not any building erected on it). 

(5) Before exercising— 

(a) a right under paragraph (1) to carry out protective works to a building; 

(b) a right under paragraph (3) to enter a building and land within its curtilage; 

(c) a right under paragraph (4)(a) to enter a building and land within its curtilage; or 

(d) a right under paragraph (4)(b) to enter land, 

Network Rail must, except in the case of emergency, serve on the owners and occupiers of the building or land not less than 14 days’ notice of its intention to exercise that right and, in a case falling within sub-paragraph (a) or (c), specifying the protective works proposed to be carried out. 

(6) Where a notice is served under paragraph (5)(a), (c) or (d), the owner or occupier of the building or land concerned may, by serving a counter-notice within the period of 10 days beginning with the day on which the notice was served, require the question whether it is necessary or expedient to carry out the protective works or to enter the building to be referred to arbitration under article 46 (arbitration). 

(7) Network Rail must compensate the owners and occupiers of any building or land in relation to which the powers conferred by this article have been exercised for any loss or damage arising to them by reason of the exercise of those powers. 

(8) Where— 

(a) protective works are carried out under this article to a building; and 

(b) within the period of 5 years beginning with the day on which the part of the authorised works constructed in the vicinity of the building is first opened for use it appears that the protective works are inadequate to protect the building against damage caused by the construction or operation of that part of the authorised works, 

Network Rail must compensate the owners and occupiers of the building for any loss or damage sustained by them. 

(9) Without affecting article 45 (no double recovery) nothing in this article relieves Network Rail from any liability to pay compensation under section 10(2)( a ) (further provision as to compensation for injurious affection) of the 1965 Act. 

(10) Any compensation payable under paragraph (7) or (8) is to be determined, in case of dispute, under Part 1 of the 1961 Act. 

(11) In this article “protective works” in relation to a building means— 

(a) underpinning, strengthening and any other works the purpose of which is to prevent damage which may be caused to the building by the construction, maintenance or operation of the authorised works; 

