Labour has called for a new inspection requirement for state schools to deliver a "broad and balanced" curriculum, in the wake of claims that Islamist extremists have tried to influence teaching in 21 schools in Birmingham.

The news came as the education secretary, Michael Gove, denied the suggestion that a public row between him and the home secretary, Theresa May, had led him to consider his position in the cabinet.

Asked if the "very public row" had damaged David Cameron's government and if he was considering his position in the light of Ofsted's findings, Gove responded: "No."

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