42. Network Rail must not use any land or property of the Trust forming part of the waterways for the passage or siting of vehicles, plant or machinery employed in the construction of the specified work other than—
(a)with the consent in writing of the engineer whose consent must not be unreasonably withheld; and
(b)subject to compliance with such reasonable requirements as the engineer may from time to time specify—
(i)for the prevention of detriment; or
(ii)in order to avoid or reduce any inconvenience to the Trust, its officers and agents and all other persons lawfully on such land or property.