Commentary on Sections Notification requirements Section 66: Notification requirements: changes
This section stipulates that the person must notify police of any changes made to the information initially provided..  This must be done within a three day period from the date when the change occurs. It also allows the person to notify the police before a change to the information occurs.  This advance notification must include the date when the change is expected to occur.
Changes to information includes: the use of a name not previously notified; a new home address; any premises in the United Kingdom where they have stayed for a qualifying period (and which has not already notified to the police); any change relating to the address of any other premises in the United Kingdom at which they regularly reside or stay; a change to any other details prescribed by regulations made by the Department; and when they have been released from custody, or discharged from hospital detention.
A qualifying period is defined as a period of seven days, or two or more periods, in any twelve months, which taken together amount to seven days.