47.—(1) TfL must, so far as is reasonably practicable, exercise the powers conferred by article 16 (protective works to buildings) so as not to obstruct or render less convenient the access to any apparatus.
(2) TfL must not, in the exercise of the powers conferred by section 11(3) (powers of entry) of the 1965 Act, as applied by this Order, or by article 18 (power to survey and investigate land, etc.), make any trial holes which interfere with any apparatus without the consent of the specified undertaker (which must not be unreasonably withheld).