Schools should remove Ofsted banners from their railings to put the inspectorate “back in its box,” a school leaders’ union chief will urge.

Simon Kidwell, president elect of the National Association of Head Teachers (NAHT), will say that the current inspection framework “isn’t fit for purpose” and is “doing more harm than good”.

In a speech to hundreds of school leaders at the union’s annual conference, Mr Kidwell will say the current model “causes unacceptable collateral damage” to mental and physical health.

Pressure has been mounting on the schools watchdog in England to introduce urgent reforms to the inspection process.

It comes after the death of Ruth Perry, headteacher at Caversham Primary School in Reading, Berkshire, who killed herself in January while awaiting an Ofsted report which downgraded her school from the highest rating to the lowest possible.

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