Christine Blower, general secretary of the National Union of Teachers (NUT), has accused Ofqual of "shifting blame" in a report which suggests pupils have been let down by the exams system.
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British soldiers will join troops from some 30 countries who work in the country.
The demand comes after the Prime Minister urged a "grown up" relationship between her government and the devolved administrations.
The rapper failed to make it to London in time as he had problems with his passport.