Thousands of children are being taught in unregistered schools across England, many more than previously thought, Ofsted's chief inspector has said.

Sir Michael Wilshaw said a crackdown had found more than 100 suspected illegal schools - half of which were faith-based, Ofsted said.

Roughly a third of them were Islamic and a sixth either Christian or Jewish.

Seven warning notices have been issued to schools in London, Wolverhampton, Birmingham, Luton and Staffordshire.

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