12. A crop inspection for certification must be carried out by a licensed crop inspector; except for the inspection of—
(a)a crop intended for the production of pre-basic or basic seed, or
(b)a crop producing seed when the entry of the seed under regulation 11 was too late to allow the Secretary of State to grow a control plot,
when the inspection must be carried out by an official crop inspector appointed by the Secretary of State for the purposes of such inspection.