For those who live in NZ, how often does One and Three cut into programming for breaking news as it did last Friday. I'd assume it's quite rare.
According to Wikipedia, the last three times a 1 News special has aired outside the Gov't Budget, were the 2016 Kaikoura Earthquake, 2016 U.S. Election and the 2014 Sydney hostage crisis. However, I'm not sure when that list was last updated, and considering that the list does not yet include recent events in Christchurch, it would be reasonable to take the list with a pinch of salt.
The page for Newshub does not have any list of such broadcasts.
Putting the butt into butter