Paragraph 4
Seed potatoes shall not be classified–
as Pre-basic TC seed potatoes, if the immediately succeeding crop produced from those potatoes is likely to contain–
plants of another variety; or
virus affected plants;
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–
deviate from variety and type, is likely to exceed 0.01% of the total number of plants in that crop; or
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
as basic seed potatoes, if, in relation to the immediately succeeding crop produced from those potatoes, the number of growing plants which–
deviate from variety, is likely to exceed 0.1% of the total number of plants in that crop;
deviate from variety and type, is likely to exceed 0.25% of that total number; or
show symptoms of mild or severe virus diseases attributable to infection in the mother crop, is likely to exceed 4% of that total number.