An ideology "at odds with traditional British values" has taken hold at the schools inspectorate Ofsted, a group of leading educationalists and Muslim leaders have warned.

Led by Sir Tim Brighouse, a former chief education officer in Birmingham, the 20 experts – unhappy at the way Ofsted has conducted inspections into schools allegedly infiltrated by conservative Muslims – say in a letter to the Guardian that it is at risk of compromising political independence by producing "tarnished reports".

Their intervention comes days before Ofsted publishes results of an inspection of 21 schools ordered by education secretary, Michael Gove, after claims conservative Muslims were trying to infiltrate the governing bodies of Birmingham schools in a plot dubbed Operation Trojan Horse.

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