As soon as may be, after the submission of the regional plan, the master plan or the new town development plan but, not later than such time as may be prescribed, the Government may, after consulting the Director, either approve the said plan or may approve it with such modifications, as they may consider necessary, or may return the said plan to the appropriate planning authority to modify the plan or to prepared a fresh plan in accordance with such directions as the Government may issue in this behalf and resubmit it to the Government for approval.