11. An authorised officer may not certify seed potatoes as basic seed potatoes unless the officer is satisfied that the land on which the seed potatoes are or were grown—
(a)has, following an official examination performed prior to the planting of the crop, been found not to be contaminated with Potato Cyst Nematode (Globodera spp. infesting potatoes);
(b)is not land notified as infested with Potato Cyst Nematode (Globodera spp. infesting potatoes) under paragraph 7 of Schedule 15 to the Plant Health (Scotland) Order 2005;
(c)has not been found to have been contaminated with Potato Cyst Nematode (Globodera spp. infesting potatoes) for at least 6 years prior to the planting of the crop; and
(d)has not been used for growing potatoes at any time during the 5 years immediately preceding the planting of the crop.