18. Any order, direction, agreement, permission, a roval, determination, notice, proceeding or decision made, taken, given or served before April 1965 by or on behalf of the council of the county of Middlesex as planning authority under the Act of 1962 (except Part II and sections 67, and 69 thereof) or the regulations of 1960, or having effect as if so made, given or served, shall, so far as it relates to any land in the urban district Potters Bar, have effect as if it had been made, taken, given or served by council of the county of Hertfordshire and, so far as it relates to any land in the urban districts of Staines and Sunbury-on-Thames, have effect as if had been made, taken, given or served by the council of the county of Surrey.