24.—(1) This article applies to relevant material of a description specified in Part B of Schedule 6 which is moved from a place in Northern Ireland, or through Northern Ireland, to a destination outside Northern Ireland.
(2) The requirements in article 22(2) and (4) do not apply if the relevant material—
(a)originates in Great Britain; or
(b)is accompanied during its transit through Northern Ireland by a document of a type normally used for trade purposes which certifies that the material originates outside Northern Ireland and is in transit to a final destination outside Northern Ireland and the conditions in paragraph (3) are met.
(3) The conditions are that—
(a)the packaging in which the relevant material is transported and any vehicle which is used to transport the material is free from soil and plant debris and any relevant plant pest in relation to which Northern Ireland is a protected zone;
(b)the material was sealed immediately after packaging or, where appropriate, after loading, and remains sealed during the transit of the material through Northern Ireland; and
(c)the nature or construction of the packaging in which the material is transported and any vehicle which is used to transport the material are sufficient to ensure that there is no risk of any relevant plant pest which may be present in or on the relevant material escaping.