17.—(1) Any licence, notice, direction or permit under this Order must be in writing, may be general or specific, may be subject to conditions and may be amended, suspended or revoked by notice in writing at any time.
(2) A notice of amendment, suspension or revocation of a licence, notice, direction or permit issued under this Order must be served, —
(a)in the case of a specific licence, notice, direction or permit, on the person to or on whom that licence, notice, direction or permit was issued or served; or
(b)in the case of a general licence, notice, direction or permit, in such manner as the Secretary of State, National Assembly for Wales, veterinary inspector or inspector (as the case may be) may reasonably consider most appropriate to bring it to the attention of those affected by it.