Certified seed potatoes
10. A growing crop certificate must not be issued containing a statement that seed potatoes are capable of being marketed as certified seed potatoes 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; and
(b)the land on which the seed potatoes are growing or were grown is land which has not at any time during the period of four years immediately preceding the planting of that crop been used for growing potatoes.