24.—(1) The amount of an unpaid financial penalty is recoverable from L as a debt owed to the enforcement authority unless the notice has been withdrawn or quashed.
(2) Proceedings for the recovery of the financial penalty may not be commenced—
(a)before the expiry of the period for requesting a review specified in the penalty notice by virtue of regulation 18(2)(h)(ii),
(b)where a review has been requested under regulation 21(1), before the enforcement authority has served notice of its decision under regulation 21(2)(c), and
(c)where the enforcement authority has served notice of its decision under regulation 21(2)(c) confirming the penalty notice, before the expiry of the period within which L may appeal under regulation 22.
(3) In proceedings for the recovery of a financial penalty, a certificate which—
(a)purports to be signed by or on behalf of the person having responsibility for the financial affairs of the enforcement authority, and
(b)states that payment of the financial penalty was or was not received by a date specified in the certificate,
is evidence of the facts stated.