The Seed Potatoes (Scotland) Regulations 2000

4.  Seed potatoes shall not be classified–

(a)as Pre-basic TC seed potatoes, if the immediately succeeding crop produced from those potatoes is likely to contain–

(i)plants of another variety; or

(ii)virus affected plants;

(b)as Pre-basic 1 or Pre-basic 2 seed potatoes, if, in relation to the immediately succeeding crop produced from those potatoes, the number of growing plants which–

(i)deviate from variety and type, is likely to exceed 0.01% of the total number of plants in that crop; or

(ii)show symptoms of mild or severe virus diseases attributable to infection in the mother crop, is likely to exceed 0.01% of that total number; or

(c)as basic seed potatoes, if, in relation to the immediately succeeding crop produced from those potatoes, the number of growing plants which–

(i)deviate from variety, is likely to exceed 0.1% of the total number of plants in that crop;

(ii)deviate from variety and type, is likely to exceed 0.25% of that total number; or

(iii)show symptoms of mild or severe virus diseases attributable to infection in the mother crop, is likely to exceed 4% of that total number.