23. A penalty notice given by an enforcement authority must—
(a)give such particulars of the circumstances alleged to constitute the offence as are necessary for giving reasonable information about the offence;
(b)state the amount of the penalty;
(c)state the period during which, by virtue of regulation 25, proceedings will not be taken for the offence;
(d)state the person to whom, and the address at which, the penalty may be paid, and the ways in which the penalty may be paid; and
(e)state that payment must not be made in cash.