4. Where specified plant material is determined by an inspector to be possibly contaminated for the purposes of Article 5(1)(a)(iii) and Article 5(1)(c)(iii) of Directive 98/57/EC—
(a)without prejudice to Article 20, a person shall not knowingly plant that material or knowingly cause or permit it to be planted; and
(b)a notice under Article 32 may require that material to be used or disposed of in accordance with paragraph 5.