On the repeal of the said Schedule as respects any area, the development plan which was in force in the area immediately before the repeal takes effect (hereafter in this Schedule referred to as “the old development plan”) shall, subject to the following provisions of this Schedule, continue in force as respects that area and be treated for the purposes of this Act, any other enactment relating to town and country planning and the M1Land Compensation (Scotland) Act 1963 as being comprised in, or as being, the development plan therefor.