49. If in consequence of the exercise of the powers conferred by the Order the access to any apparatus or land owned by Northumbrian Water and used by it for the purpose of its statutory functions is materially obstructed, the undertaker must provide such alternative means of access to that apparatus or land as will enable Northumbrian Water to maintain or use the apparatus or use the land for the purpose of its statutory functions no less effectively than was possible before the obstruction.