The Ofsted inspection system will be toughened up amid concerns over school standards in the wake of the alleged "Trojan Horse" takeover plot in Birmingham.

Sir Michael Wilshaw, the chief inspector, said around 20 schools had already been subjected to close scrutiny because of serious failings in the way they are run by governors – an issue at the heart of problems in the West Midlands.

It emerged that schools in towns and cities such as Bradford and Luton – other areas with large Muslim populations – had been targeted over governance issues.

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