22. A notice which is served under regulation 21 shall—
(a)state that the enforcement authority suspects that a requirement of this Part of the Regulations has been contravened;
(b)specify the reason it is suspected that a requirement of this Part of the Regulations has been contravened and give particulars thereof;
(c)require the producer to comply with the requirement;
(d)specify the period of time within which the producer must comply with therequirement; and
(e)warn the producer that unless the requirement is complied with or satisfactory evidence has been provided within the period specified in the notice he may be prosecuted under regulation 23.