22. Every non-automatic weighing machine shall be provided with—E+W+S
(a)either:
(i)an irremovable plug or stud made of soft metal; or
(ii)in the case of a Class I machine a special plate permanently and irremovably attached to the base of the machine; or
(b)such sealing arrangements as may be provided for the stamp as set out in the certificate of approval or the notice of examination in respect of that pattern.