The decision follows a call from all nine of the county's MPs to resign after a damning inspection by the schools watchdog, Ofsted.
Norfolk County Council says Ms Christensen is taking early retirement and will receive only her contractual entitlement. She will receive two months’ gross salary in lieu of notice - £23,248.
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The boss of the region's ambulance service declared the trust "is not going into special measures" as it faces the prospect of a £3m fine.