The boundaries of the new local government areas shall be mered by Ordnance Survey.

Any such boundary defined on the map annexed to any order under Part VI of the 1933 Act or Part II of the M1Local Government Act 1958 by reference to proposed works shall, if the works have not been executed at the time of the completion of the first survey made after the passing of this Act for a new edition of Ordnance Survey large-scale plans including that boundary, be mered as if the boundary had not been so defined.