The lowering of the parapet wall on the second storey rear elevation of the extension by 200mm, the raising of the cill height of the window of the ensuite bathroom in the second floor north elevation of the extension to 1m above the floor level of the room, an increase in the length of the freestanding wall to the rear of the dwelling to 8.3m and the raising of the valley height between the two gables to the second floor rear elevation.