7E+WIn determining whether the relevant land forms part of such an area as is mentioned in the said paragraph 3,—
(a)in the case of an area designated as the site of a new town by an order which became operative on or before the twenty-ninth day of October, nineteen hundred and fifty-eight, regard shall be had to that order in the form in which, whether as originally made or as subsequently varied, it was in force on that day, and any variation becoming operative after that day shall be disregarded;
(b)in the case of an area designated as the site of a new town by an order which became operative after the said twenty-ninth day of October, whether before or after the passing of this Act, regard shall be had to the order in its original form, and any variation of the order shall be disregarded.