This paragraph sets out the period which must elapse from the start of their notification requirements before an offender can apply in writing to the Chief Constable to discharge them from the notification requirements. An offender cannot apply if they are subject to a sexual offences prevention order or an interim sexual offences prevention order or notification requirements for a fixed period which has not expired. Otherwise an offender can apply to be reviewed eight years after the beginning of the notification period if the offender was under 18 at the time of conviction or after 15 years if the offender was an adult. The paragraph also ensures that any period spent in prison for a relevant event after the date of notification is disregarded for the purpose of calculating the review period.