The majority of headteachers believe the Ofsted school grading system is "unreliable", according to a survey carried out by a teaching union.

Some 85% of school leaders said they were "unconfident" in the education inspectorate for England, data revealed by the NAHT school leaders' union has revealed.

Almost two-thirds (64%) said the one-word grade given by the Ofsted for a school's effectiveness - ranging from "outstanding" to "inadequate" was not reliable.

When asked how they felt about their school's next inspection, the top five words used by leaders included "anxious", "sick", "stressed", "terrified" and "dread".

The Beyond Ofsted inquiry found Ofsted has a "detrimental impact" perceived by some to be "toxic" - and called for "transformational change".

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