by the Welsh Ministers;

for the Welsh Ministers in accordance with arrangements for official measures made under regulation 27; or

by a responsible authority elsewhere in the United Kingdom F1; or

by a competent authority outside the United Kingdom if the Welsh Ministers are satisfied that those growing trials are of equivalent standards to those carried out by or on behalf of the Welsh Ministers.

establish whether a variety is distinct, uniform and stable; and

be conducted, as regards trial design, growing conditions and characteristics of the variety to be covered, in accordance with an appropriate protocol.