8.—(1) Official measures, particularly growing trials, on the results of which an acceptance of a variety on to a National List is based, shall cover a sufficient number of characteristics for the variety to be described; and the methods used for determining characteristics for this purpose shall be exact and reliable.
(2) For the purposes of establishing distinctness the growing trials shall include at least the available comparable varieties known in the Community.
(3) For the purpose of accepting a variety on to a National List under a name determined in accordance with regulation 6, the growing trials for distinctness shall also include other available comparable varieties not known in the Community.