GCSE English: Low grades shock for Wales in January exams
Head teachers from across Wales have raised concerns over the "unexpectedly low" results for GCSE English language exams sat earlier this year.
One teaching union said it had received a "flood of concern" after the results for the January exams in Wales were "far below what was expected".
In 2012, a row over GCSE English exam results led to thousands of papers being re-graded.
The Welsh government said comparisons with previous exams were "misleading".
BBC Wales education correspondent Arwyn Jones reports.