Schools are being used by individuals who want to narrow youngsters' horizons, and in the worst cases "indoctrinate impressionable minds" under the guise of religious belief, the head of Ofsted is warning.

Inspectors are increasingly coming across those who want to "actively pervert" the purpose of education, according to Amanda Spielman.

In a speech today, she will warn schools that they should not assume that the "most conservative voices" of a particular faith group speak for everyone, and that they must not be afraid to "call out" any practices that they feel could have a negative impact on young people.

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