53.—(1) LUL must, so far as is reasonably practicable, so exercise the powers conferred by article 18 (protective works to buildings) so as not to obstruct or render less convenient the access to any apparatus.
(2) LUL must not, in the exercise of the powers conferred by section 11(3) of the 1965 Act (powers of entry), as applied by this Order, or by article 20 (power to survey and investigate land, etc.), make any trial holes which interfere with any apparatus without the consent of the undertaker (which must not be unreasonably withheld).