Smart watches, connected to the internet, are already banned from use by students taking public exams.

But the review, commissioned by exam boards, says it is becoming difficult to distinguish between hi-tech and traditional watches.

Review chairman Sir John Dunford called for a "blanket ban" on watches.

The Independent Commission on Examination Malpractice, set up by exam boards to investigate the prevalence of cheating in public exams in England, Scotland, Wales and Northern Ireland, says that overall there is a "very low level of malpractice".

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