The head of Phase Two of New Zealand's Covid Inquiry says turnover is 'perfectly natural' as it loses two of its high-ranking officials.

Executive Director Andrew Sweet is stepping down just months before the second phase is due to end in February.

His predecessor, Helen Potiki, similarly lasted five months before walking away.

Inquiry Chair Grant Illingworth KC told Mike Hosking nobody has been dissatisfied with their experience in the inquiry.

He says two people have been offered very good jobs and are leaving for that reason.

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THE ART OF FAITH - The Annunciation by Fra Angelico