No action may be taken under section 87 or section 88 against a person in respect of an act of littering for which a civil penalty charge notice has been given and paid in full, regardless of whether or not the person who paid it is the vehicle's keeper.
After the end of the period of 28 days beginning with the day on which a civil penalty charge notice is given, any unpaid amount of the charge may be recovered in like manner as an extract registered decree arbitral bearing a warrant for execution issued by the sheriff for any sheriffdom.