The Seed Potatoes (England) Regulations 2015

10.—(1) No growing crop certificate may be issued containing a statement that seed potatoes are capable of being marketed as certified seed potatoes unless the authorised officer is satisfied that the land on which the seed potatoes are growing or were grown—

(a) is land which, as a result of a soil test carried out by the Secretary of State prior to the planting of the crop, has been found not to be contaminated with Potato Cyst Nematode (Globodera species infesting potatoes);

(b) is not demarcated under Schedule 14 to the Plant Health (England) Order 2015 as infested with a European population of Potato Cyst Nematode; and

(c) has not been used for growing potatoes at any time during the four years immediately preceding the planting of the crop.

(2) But sub-paragraph (1)(a) does not apply in the case of seed potatoes grown in a soil-free medium.