122. Regardless of any provision of this Order or anything shown on the land plans or contained in the book of reference to the Order, the undertaker must not (a) appropriate or acquire or take temporary possession of apparatus or (b) appropriate, acquire or extinguish interfere with or override any easement, other interest or right and/or apparatus any apparatus belonging to or maintained by Wales and West Utilities otherwise than by agreement, provided that such agreement is not unreasonably delayed or withheld.