(1) Subject to this section, the Minister may, while a permit is in force, by notice in writing served personally, by post or otherwise as prescribed on the holder of the permit, vary or revoke any of the conditions of the permit or impose further conditions.
(2) In deciding whether to vary or revoke any of the conditions of a permit or to impose further conditions, the Minister must have regard to:
(a) the purposes and principles of the Madrid Protocol; and
(b) if the decision could affect a seal in seas to which the Seals Convention applies--the purposes and principles of the Seals Convention.