The Education Secretary, Nicky Morgan, has asked officials to review home schooling amid fears that thousand of children are having their minds "filled with poison" by radicalised parents.

Between 20,000 and 50,000 children are thought to be educated at home – but the Government has no idea of the exact number because parents are under no obligation to inform their local council.

Ms Morgan has already announced a crackdown on unregistered schools and "weekend madrassas" after some were found to be promoting extremist ideology. But senior government sources have revealed that home schooling is now "on the radar".

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