For the protection of the affected undertakers referred to in this Part of this Schedule (save for National Grid which is protected by Part 3A and 3B of this Schedule, Doggerbank Offshore Wind Farm Project 1 Projco Limited and Doggerbank Offshore Wind Farm Project 2 Projco Limited which is protected by Part 7 of this Schedule and Northern Powergrid which is protected by F1Part 9 of this Schedule) the following provisions must, unless otherwise agreed in writing between the undertaker and the affected undertaking concerned, have effect.