7. A growing crop certificate must not be issued containing a statement that seed potatoes are capable of being marketed as basic seed potatoes of any class unless the authorised officer is satisfied that—
(a)the land on which the seed potatoes are growing or were grown is land which as a result of an official soil test carried out prior to the planting of the crop has been found not to be contaminated with potato cyst nematode (Globodera species infecting potatoes); and if potato cyst nematode has been found on that land at any time during the period of 12 years immediately preceding the planting of the crop that—
(i)the land is no longer demarcated under Schedule 15 to the Plant Health (Wales) Order 2006 as infected with potato cyst nematode;
(ii)six years have elapsed since the last positive finding of infection by potato cyst nematode on the land; and
(iii)except as authorised under paragraph 5 of Schedule 15 to the Plant Health (Wales) Order 2006, the land has not been used for growing potatoes at any time during the period of 11 years immediately preceding the planting of the crop; and
(b)the land on which the seed potatoes are growing or were grown is land which has not been used for growing potatoes at any time during the five years immediately preceding the planting of the crop.