20.—(1) Any person carrying out any of the following operations must be licensed to do so by the Secretary of State—
(a)marketing seed;
(b)packing, sealing or labelling seed;
(c)re-packing, re-sealing or re-labelling seed;
(d)preparing mixtures of seed for marketing;
(e)cleaning, treating or in any other way processing seed intended for marketing.
(2) But the requirement for a licence does not apply in relation to the marketing of—
(a)small packages of seed as defined in Schedule 3;
(b)unpacketed seed; or
(c)seed, as grown, for processing, provided the identity of the seed is ensured under paragraph 2 of Schedule 4.