13. The liability of a person who is the keeper of a vehicle to pay a fixed penalty for a littering offence in respect of the vehicle is discharged if—
(a)a notice under section 88(1) of the EPA 1990 is subsequently given to a person in respect of the same offence (whether or not the person is the vehicle’s keeper), or
(b)a prosecution is subsequently brought against a person under section 87 of the EPA 1990 in respect of the same offence (whether or not the person is the vehicle’s keeper and whether or not the prosecution is successful).