Editing Time from NPL (MSF) (section)

=== Shortcomings of the current signal format ===
MSF does not broadcast any explicit advance warning of upcoming [[leap second]]s, which occur less than once a year on average.<ref name="TROGER" />  The only indication is a change in the number of padding bits before the time code during the minute before the leap second. Therefore, unless a leap-second announcement is manually entered into a receiver in advance, it may take some time until an autonomous MSF receiver regains synchronization with UTC after a leap second (especially if the reception is not robust at the time of the leap second).

Like DCF77, the time signal only provides 1 hour warning of summer-time changes.<ref name=NPLTFS />