Variation of terms and conditions of permits
10.  The Director may —
(a)having regard to the status of the pests or beneficial organisms for the control of pests or the plants, plant products or other materials in respect of the import of which a permit has been issued under rule 4 or 7, as the case may be; and
(b)in accordance with the provisions of any international agreement or memorandum of understanding pertaining to the international movements of such pests or beneficial organisms or plants, plant products or other materials,
from time to time and in such manner as he thinks fit vary the terms and conditions subject to which the permit has been issued.