Michael Barry, the headteacher of St Matthew Academy in Blackheath, London, tells ITV News that Ofqual's findings have "tarnished the teaching profession" and says the body should have resolved the issue by re-grading the GCSE English exams.
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A man, reportedly armed with a knife and a baseball bat, was detained close to the event and police cleared the area as a precaution.
A remarkably mild night
Thousands of people have gathered in the centre of Manchester for a vigil in the wake of the terror attack.