(3) When potato seed is stored in an open shed, in addition to the provisions of sub-regulation (2), volunteer Solanaceous or old sprouting potato tubers shall not be allowed within fifty metres of such open shed. (4) When an inspector is satisfied that potato seed has been stored contrary to the provisions of this regulation, he may(a) in the case of potato seed which has not been certified, refuse certification; or (b) in the case of potato seed which has been certified, cancel such certification. 13. Unless cancelled earlier, the validity of a certification for potato seed shall be sixty days from the date of the tuber control: Validity of certification Provided that upon the expiry of a certificate a further tuber control may be carried out and the seed may be recertified for a like period. 14. Any person aggrieved by any decision under these Regulations of Appeals an Inspector may appeal to the Certifying Authority and to the Minister from any decision of the Certifying Authority. 15. The fees prescribed in the Fourth Schedule shall be payable in respect of the matters therein set out. Fees