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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.
Pupils from St Matthew Academy in Blackheath, London, tell ITV News about the pressures they are facing now that their GCSE English results have been downgraded by the exams regulator.
Headteacher Michael Barry told ITV News that Ofqual's finding that teachers "over-marked" English GCSEs is "wrong".
Deputy General Secretary of the Association of School and College Leaders Malcolm Trobe said teachers and schools would be "insulted" by Ofqual's report.
An English teacher has told ITV News that Ofqual's report was the "latest in a category of insults against teachers".
Chris Edwards, who wrote an open letter to Education Secretary Michael Gove in September criticising the decline of A* to C GCSE grades, said:
Asked whether teachers were under pressure to secure good grades, Mr Edwards said:
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.
Ofqual's report into GCSE English exams found that many schools used the marks pupils received in their first exams and the January grade boundaries to work out what score a pupil would need in their controlled assessment and marked it accordingly.
The majority of controlled assessment work was submitted in the summer, and examiners saw evidence of over-marking.
As a result, grade boundaries were raised to take account of this, and led to some students getting lower grades than expected.
Ofqual chief regulator Glenys Stacey said the distribution of this year's GCSE English results, which saw bunching around the C grade boundary, was "shocking".
Ofqual chief regulator Glenys Stacey has said "children have been let down" by school exam systems and that she was "shocked" by the findings of the report.
Headteachers have said that tens of thousands of teenagers received lower GCSE English grades than expected this year after exam boards moved the grade boundaries between January and June.
An initial report by Ofqual concluded that some of January's assessments were "graded generously" but the June boundaries were properly set and candidates' work properly graded.
The regulator today published its second report, looking at the reasons behind the changes in results.
Latest ITV News reports
Some secondary school teachers were guilty of "significantly" over-marking pupils' GCSE English work in a bid to boost results, Ofqual said.