27. In these Regulations in relation to black mustard, brown mustard, dioecious hemp, sunflower, swede rape, turnip rape and white mustard, including hybrids, “CS seed” means seed that —
(a)has been produced directly from officially certified basic seed or, with the breeder's written authority, from officially certified pre-basic seed, and
(b)is intended for purposes other than the production of oil and fibre plant seed.