Holding up his grandfathers passport issued in 1949, Lockwood said, "there is a past-precident, this passport was issued under His Britannic Majesty King George the Sixth, and this passport was still valid in 1954, 2 years after Her Majesty Queen Elizabeth ascended the throne."
Therefore your passport remains current and valid for overseas travel and as proof of identification, the Department of Internal Affairs has confirmed following Queen Elizabeth II’s death. “They will continue to be valid until they expire,” the department said.
A note inside New Zealand passports refers to “Her Majesty The Queen”, in her capacity as New Zealand’s head of state, permitting holders to “pass without delay or hindrance” and, where necessary, to be given “all lawful assistance and protection”.
Future passports will be issued in King Charles III’s name, the department said. Until then, all passports will continue bearing The Queen’s name until present stocks run out.